Zhenya considered the Professor's question for a moment. Hmm... "What I mean by what I said - is that there's the dark wizards who know how to cast the spells well, but there's the wizards that might now how they are cast but will never have enough intent to properly cast the spell, because they..." how could she explain it? "Umm.. because non-dark wizards don't sit around practising dark magic, therefore they don't know exactly how to cast it. Someone who isn't a dark wizard might try the spell at a time they think it is needed, like a family member being endangered, but because they aren't experienced or dark enough to truly want to harm the other person, the spell doesn't work. But if it does work, then I think it doesn't make a wizard dark because their intent came from their need to protect someone else," she explained.

OOC: haha sorry, I'm not very good at explaining things sometimes. Hope that makes some sense..