I'm sure we have all seen this. The mask is doused, 3 people are wailing on it. By some miracle, it survives. But as the 4th person lets loose with the water, it hits the mask, while still doused and counting down. Everyone within a square of it immediately gets flung back and possibly lit on fire.
Same thing happens as the mask is doused and one is within a certain range of the mask. A huge knockback, akin to civ, and maybe not as severe as a levi, dealing elemental damage and chance of fire.