Rabastan threw a roll and hit Rodolphus in the back of the head before he managed to get to the group. He's glamoured, but not so much that Rodolphus couldn't tell who he was.
"Come here, prat," he said.
When Rodolphus got to him, he held up a piece of parchment and hissed, "Since when do you associate with mudbloods and blood traitors?"