You and Varian were experimenting with alchemy. Well, Varian was. He didn't trust you, and believed you'd most like burn down the building, whether that may be purposefully or accidentally. Anyway! Varian realised that there wasn't any of one of his chemicals left.

"Right, I'm gonna go get some more of this, okay? Don't. Touch. Anything!"

with that, Varian exited the room.