I fail to see how you can do like...telekinesis with fire. Fire is good at doing things with fire. You can narrow it, remove it, lots of it, little of it, but at the end of the day you're moving heat around. Air you can do a lot with as well...remove it from most things, and they fall apart, but unless there's something to keep it from running back in again, like when you're outdoors, that's gonna be tough. You can't do ANYTHING with ANYTHING unless you get really creative, and the more intricate things get, the more you have to stretch to make your element do what you need it to do, ups the difficulty of the spell. I mean, sure, maybe you can do some sort of delicate spell where you just sorta move heat around creating some sort of warm air cushion that pushes your coffee cup to you but...wouldn't that just be really damned hard? Harry grabs his staff (heh) with wind, but could he do that with his coffee cup and not spill it?