Granted, Yuusei doesn't really know who Reira is yet. They've probably never met in person, and even if they had, it's doubtful that they'd recognise each other in their current forms. He does, however, remember her from her Muel Donsters match (an event he only managed to get a peek at but was at least aware that one of their own would be participating). He doesn't recall a name, but he at least knows this is the one, and since she's part of the carnival...

Another swift wag of his tail pushes more Greimen away from himself. They feel like strange rubber dog toys, honestly-- "Need a lift back home?" he asks, his void eyes softening somewhat. "Or is there anything you need to grab before we go?"