Guild Wars 2

Why can I use purging flames ( and sanctuary) underwater, but not hallowed ground ( or wall of reflect)?

well, hallowed ground should be obvious. you are not on the ground, so you cannot hallow it.

walls usually need something to stand on, and water is a poor foundation.

purging is more of an area, aura… thingie, and santuary is just a bubble so those work just fine.

but don’t try to make too much sense of how underwater skills do or don’t work. if anything underwater made any real sense, no one would be able to use shouts either…