There's lots of time!
Hmm. I believe snakes don't gulp food like a bird does, they take a while to swallow prey, so Billy has at least a few moments to do something worthwhile. Now that the snake's mouth is busy it can't bite or spit venom at *him.* And Tirin's blade is just sitting there waiting to be picked up ...
Just attempting to figure out where the sneck's right fang is: Lil Tir isn't skinny enough for the fangs to be on both sides of her, so, does that mean it attempted to bite her delectable leg? But, now what? It doesn't have a masticating jaw to chew it off, and it's not a 'gator to 'death-roll' it off
This is a perfect time for Lil Tir to wake up and punch it in the eye, or grab her knife and shove it down its gullet!
Oh, and not all vore turns out badly (some, instead of the legs breaking, simply bend, so the ankles end up behind the head, betting Lil Tir is flexible enough to do that, but of course not saying or implying that that will happen, it was just something it reminded me of)
@Guesticus: Hard to tell from the lighting and the angle of the camera --- the right fang is running parallel with the left, but you can tell because it is behind the tongue if you look closely enough (it's not penetrating lil' Tirin).