User blog comment:Derpus42/More semblance help, please./@comment-24911350-20140526140142

That's not terrilbly different from sustained flight. What's to stop her from just jumping really high, or someone else throwing/propelling her upwards? She could just use her semblance to stay up there, and hover around.

In combat it would be pointless to do that anyway because she's melee-only, but that doesn't mean it's fair or balanced, just that it breaks the rules to no effect.