[Glass? Ohh, this should be interesting. This might actually be hard than the stupid candle training.

He tries to focus on it, but it after a few seconds of it just kind of sputtering and occasionally rising and lowering, his irritation gets the better of him and he tries to just flash-burn in it to submission.

It... doesn't work very well. Instead he gets a huge flare up right in his face, sending him sprawling backwards with a scream and a flail.]