[quote=@Zarkun]
<Snipped quote by Lilygold>

Not interrupting, we're just being odd. The thing about the erasing part, how precisely does it work? A magic like that could potentially be used to erase any spell thrown her way, or the way of an ally.
[/quote]

It requires a lot more energy to erase than to push, and without proper practice, the amount of energy used to erase an entire spell could be potentially fatal. Of course, depending on the spell you are trying to erase. In most cases, you have a choice to make: Erase the side effects, not the physical spell, or erase the physical spell but not the full effect. The former takes less energy, and the latter more. However, anything being erased takes a lot out of you, so it's usually more beneficial to push. (This system makes it so that it isn't overpowered unless you have trained so that YOU are overpowered. Answer your question?)