Ratings: 2.8/8 (9.44 million viewers)

Beckett: That thing could stop a Kodiak in Kevlar. Who did he think was coming through the door?
Lanie: Well, whoever it was left him leaking from about 30 holes that don't normally appear in a healthy 35 year old male.
Beckett: 9mm Sig still in his waistband.
Castle: Didn' t even have time to pull it out...?
Beckett: This guy was armed and ready... Whoever got him was very, very good.
Castle: Ninja assassin.
Ryan: "Ninja assassin"? Isn't that kid of redundant?
Esposito: Aren't all ninjas by definition assassins?
Castle: Fine, Webster.. and Roget -- our ninja, "assasation implied by definition", scales the building, slips in through this window, and then hides himself, I don't know, about here... (Castle gets distracted)

Castle: I will do anything that you need, including nothing, if that's what you want.

Finn Rourke: He's up in heaven now -- You can be sure he broke in when they was in Vespers!

Vespers is the colloquial name within the Catholic community (as well as Catholic-related Protestant denominations) for the evening prayer, which is a very solemn and highly structured time of the day.

(Castle is feeling guilty about getting caught by the killer)
Beckett: ..If you tell anyone what I'm about to say, there's going to be another shooting, but I've gotten used to you pulling my pigtails. I have a hard job, Castle, and having you around makes it... a little more fun.

Esposito: Our boy Coonan also had a home security system. 12 gauge. Hollow point.
Beckett: That thing could stop a Kodiak in Kevlar.

"No", and "no". The depicted gun is a shotgun. And the attached cartridges are, indeed, shotgun shells. And this is accurately reflected by the term "12 gauge", which is a measure of shotgun power, and "12 gauge" is not a minor shotgun by any means (though it depends on the size and count of the shot in it, as well).

However -- the term "hollow point" is a bullet type, and has nothing to do with shotguns, which don't fire bullets but shot, that is "lots of little pebbles"(shot) rather than a single solid round(bullet). They are good close-quarters guns but have no range. Someone with no knowledge of guns though that "12 gauge" didn't "sound" badass enough, and decided to "improve" on it a little with a term they'd heard somewhere as significant to badass weaponry.

As far as its stopping power, no, a large bear, like a "Kodiak", is pretty tough, with a thick skin and lots of fur to protect it, so a 12 gauge is probably the minimum for stopping one, if it can do it at all. Stick said bear in Kevlar and he'll be eating the gun-wielder shortly, very angry that his food annoyed him... as well as whoever it was put the stupid Kevlar outfit onto him.

When Castle is unpacking the food, the voiceover doesn't quite match with what he's unpacking -- "I got sushi, I got some Italian, I got some thai, and I grabbed some hot dogs..." -- when he says "I got some Italian", he's placing a chinese-style food box (replete with pagoda on its side) on the table. While that doesn't preclude the thai being in the chinese food container, one usually would name stuff in the same order as you're placing it out, while doing so.

Ryan: "Ninja assassin"? Isn't that kid of redundant?
Esposito: Aren't all ninjas by definition assassins?
Castle: Fine, Webster.. and Roget -- our ninja, "assasation implied by definition"...

Noah Webster was a famous statesman, author, and lexicographer whose reputation developed in post-Revolutionary America. He wrote many textbooks which became the standards for five generations of children to learn to read and write, as well as the most significant early dictionary of "American" English, establishing his name as synonymous with dictionaries in America. He was cousin to Daniel Webster, one of the most popular statesmen of early 1800s America.

Peter Roget was a famous British lexicographer most well-known today for the 1852 publication of Roget's Thesaurus, a work which cross-referenced words and phrases with others with similar meanings, and with antonyms. Roget is also credited with a major development in slide rules, the "log-log" slide rule, and was one of the founders of what later became the Royal Society of Medicine.

Castle: Well, maybe instead of using a stiletto, he was wearing stilettos...

A stiletto blade is a long, thin triangular shaped knife, whose original purpose was to punch through mail or chinks in the male, of a wounded and prostrate knight-in-armor. In America, a switchblade (as shown, and illegal in many places) is a common type of stiletto.

A stilleto heel, also called a "spike heel", is a shoe (usually a woman's, though styles have varied in place and time) which has a long, thin heel, and which would raise one's height typically by 2 or more inches.

Agent Forrest: 'Cause all their were were overtures. And I wasn't about to trade the family cow for a bunch of magic beans.

A clear reference to the cautionary fable Jack and the Beanstalk, wherein the young and foolish Jack, his desperate family needing money, trades the family's lone cow for "magic beans" instead of money. While Jack does get lucky, and the beans really are magic, this isn't something one should expect in such a trade.

Title: Sucker Punch

A boxing or fighting reference, generally referring to a punch that is made unexpectedly, often as the first blow of a fight, before the fight is expected, often by appearing amicable or friendly up to the moment of delivery. It refers in boxing to any punch which is made outside of the official rules for boxing, including illegal strikes(such as the groin or the kidneys) and strikes made outside the allowed combat time.

Castle: Negative, Ghostrider, it's a small price to pay for a shot at your mother's killer.

Ghostrider is a Marvel Comics character, who has been through several variant incarnations -- generally he is a demonically connected individual who goes after criminals and other villains driven by a spirit of vengeance.

Beckett: I've gotten used to you pulling my pigtails.

Pigtails are a style of girl's hair, usually only worn by young girls, with the hair bunched together on either side of the head up and away from the head by a rubber band or clip. It is a childhood prank for young boys to tug at a girl's pigtails to annoy them in an effort to make themselves noticed. Beckett is characterizing her banter with Castle in fond terms.