It seems unlikely that my NPC had it set at spawn, as I’d been survived over a year and he’d just been standing there. I had completely ignored the NPC until that point. Based on some of the comments, I figured he was infected and dying, whether I talked to him or not. Actually, I think I remember talking to him a few times when I first started playing, but not for months after that.
IE: He was infected on a timer. Timer ticked down. I talked to him and it just happened to be a few moments before the timer was set to expire.
Unless the flag was set when the quest was given to me, in which case there’s no reason he should have died so quickly, which I think is what you’re saying.
Unfortunately, I wasn’t aware enough of what was going on to take screenshots and I know virtually nothing about code.