Ah...BG was just on his way back here to say something similar.
Big Gunns is gonna take a wild guess(not really he's pretty sure)on what happened to this snake. It drowned. If you're drowning you'll start "convulsing" all around. You'll also try and expel everything from your insides just like this snake did.
The Vet probably said to soak it to make sure it was well hydrated, but will a smaller snake, you need to keep an eye on them....especially a sick one...and even more especially a stupid Spider. They don't know what's up or down sometimes.
BG suspects that this animal drowned. NO...he's pretty sure that's what happened. It may have had an RI, but what happened when it was being soaked tells BG it drowned.(or suffocated because it could not breath correctly in the water...same thing really)