Kill one, save one: the time traveler's Conundrum

Nope, not a history major, just a SCAdian. (Which is almost the same thing...)

(S.C.A.:
Society for Creative Anachronism:
Worlds largest historical reenactment group: worldwide membership: over 1 Million.
Focus: the dark ages, middle ages, and renaissance. (Formerly only in Europe but has recently expanded it's scope to include the middle east, India, China, Japan, and Korea during that time period.)
Incorporation Type: Educational, Non-Profit, Non-Government-Organization.)