Hot or not, he's not touching any of Vexen's vials. He doesn't know what they do. He doesn't trust them.

"…No. Should I?" He eyes the concoction mistrustfully. He has this sinking feeling that if Vexen doesn't know what it is either, he might have the contents dumped on him to test it out. He takes a cautionary step back. The last time he did that, he turned Saix's hair pink and purple for a week. The Berserker had been pissed.