Slowly, you adjust your grip on the sword. Even more slowly, you move the Sword of Righteousness through the creature’s body. The monster seems unaffected – no painful gurgling or anything fun like that – but the slashing motion moves many air bubbles toward your mouth, which you gratefully breath in.
Looks like you have no other options. You’ve got to drink this thing, but at least now you have the focus that comes with proper oxygen levels.
To drink your way out, roll a 20 sided die.