When Riff enters he ooks fascinated at the damage the explosion caused. Then whe walks straight to the leftovers of the device which caused it. He kneels down and carefully take some samples of the class and the residue. Afterwards he impatiently stands around while the others ask there questions and leaves as soon as his politely possible.
He takes the samples to his laboratory and conducts weeks of experiments tryong to replicate the formula. Unfortunately by the time he gives up the mystery is long resolved.
Sorry, but is this is the level of Gamemastering we are going to get than I better quit now, instead of being upset for the next few weeks.