at the last moment, as your life flashes before your eyes, they snatch you from in front of a speeding bus, or you're choking to the point that you know you're dying, and they're the only one to step up to the plate and heimlich you just in time, or they save you from a certain watery death while you gasp, what would otherwise be, your last time.
but... up to that moment, you absolutely despised them. couldn't stand to look at them, hear their voice, read their posts, etc.
how, if at all, do you see them differently? how obligated do you feel to thank them? how would you? and, for how long would you do so?