I wouldn't worry about it- no idea if a temperature spike could promote this, but he's better off without this in his G.I. tract, & it might have proven to be a more problematic blockage if it had left the stomach. (What I'm saying is that he might have ended up "constipated", which is no fun at all.)
I thought more about this so I'm editing > > > Yes, after 2 weeks, I'd go back to feeding him on his regular schedule- & you might also want to feed him smaller prey for the next meal or beyond, for better digestion. For whatever reason (& it seems to be quite rare) but some snakes just don't digest as well as others- I was just remembering one snake I had like that- it was years ago & a long story, but the cause was unknown. Just like us or any other living things, some have issues that others don't.
I would not bother adding Nutribac to a snake's water, as it will be far too diluted to do much (& just be wasted) as he couldn't possibly drink much of it in a day, & if you leave it longer than that dissolved in water, it will help pathogens grow. Personally I'd dose Nutribac by installing it into the oral cavity (mouth) of the dead prey right before feeding. It should be well absorbed this way, since it will be digested with the meal. (When humans take vitamins, they're also best taken with a meal.)![]()