Counterspelled Booming Blade

[Psyren]

Psyren, I am talking about the Cauldron example, not the underwater vent.

I was talking about the vent. Boiling in a cauldron I would expect to be less damaging than swimming in a volcanic plume, even if both are underwater.

I find it wonky that a person trapped in a cauldron of boiling water takes more damage with their head out of the cauldron then when completely submerged, by RAW.

Even if you rule that one invokes the resistance while the other doesn't for some reason, it doesn't follow that a volcano will do less damage than mere boiling water. You have the tools to avoid the incongruous result rather than simply throwing up your hands and declaring it to be "wonky."