"Same snake, actually," Fred pointed out, when Hestia mentioned his dad being attacked by one too. "Don't remember much about Dad being treated except they tried those muggle slitches? Whatever they're called, and it dissolved them right away."
And he wasn't even sure how he knew it was the same snake, except he remembered Harry talking to them later - and he knew it was Voldemort's bloody pet or something.
"We'll have to go back," He said, and he wasn't sure who he was saying it to. Maybe Roger, except that Roger wasn't a part of the group that would have to go back and figure things out. "See who the woman was that the snake was using." And see if there was any way to figure out where the sodding thing was now.