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Taggart's theory is that solar flares caused by the eclipse, or the 'Phoenix Effect', are to blame when people start to spontaneously combust.
When Carter discovers that a blast of radiation from the artifact had penetrated the wall of the chamber and is actually to blame for the spontaneous combustion, it becomes a race against time to save the other two people exposed - Nathan and Kevin!
When Taggart causes a small explosion of skin grafts (goo), the shot remains with him but he appears untouched by the flying goo. Two shots later, he is covered in it just like Carter.