Kurumi could honestly say that she had no intention of sticking her head - or any other part of her body for that matter - into said jar. Especially not after it was confirmed what the jar was. She HAD ready about them, mostly in her history textbooks and what not, so she knew a little bit about what was going on now. Which is why her hand went up this time.

"A Deatheater stuck his head in the jar and it began to morph back into the head of a baby," Kurumi said as she lowered her hand to her desk. "I suppose you could say that the jar's role in the battle was that it served as a distraction. Something that weakened the Deatheater by returning him to his youth." Since, you know, the man had asked what role the jar had played and not just what had happened and all.