Water fights

Harry finds speaking an incantation has no effect under water

Extract from Harry Potter and the Goblet of Fire

by J.K. Rowling

‘Relashio!’ Harry shouted, except that no sound came out ... a large bubble issued from his mouth, and his wand, instead of sending sparks at the Grindylows, pelted them with what seemed to be a jet of boiling water, for where it struck them, angry red patches appeared on their green skin.


Harry Potter and the Goblet of Fire

By J.K. Rowling