Avalon could think of several disadvantages to trapping someone in a bubble. First, the obvious fact that the bubble can't be popped by force alone. So if you lost your wand or for some reason couldn't cast a counter spell, the person would be stuck. Which might be good if you were dueling some evil wizard, but from what she had seen, most people used Ebulio as more of a prank. But since Trent alluded to the non-popping principle himself, she thought she'd offer a different point.

She raised her hand. "Can you control the height of the bubble once you cast it? This might be an advantage or a disadvantage based on how you look at it and whether or not you were fighting a dark wizard or just messing around. But if the bubble floated really high up, the target could be seriously injured once the bubble popped and they fell back down. You'd have to be ready with a slowing charm as soon as you performed the counter-jinx." What if you really couldn't control the height of the bubble, and you just floated all the way up into space? Have people ever gone missing due to Ebulio?