Hognose tries to eat itself.

[TJ_Burton]

That wouldn't stop it from eating; hogs will eat fully submerged in water a long with ball pythons and plenty of other snakes.
Alcohol would have been a start, but you can easily remove the head of the snake from its tail BEFORE it gets to the point shown in the video. There is no reason it should have gotten that much of its body down its own throat.