Rounding a corner, there's definitely one recognizable smiling face out and about. Sato is in the middle of being mobbed by a handful of zombies and, as far as anyone can tell from his expression... seems to be genuinely enjoying himself. He kicks one back, but as he turns to bury the machete in the next one's head, a third lunges for him and sinks its teeth into his upper arm, while another that he'd kicked down earlier grabs a leg and starts tearing at a pant leg, eager to rip into flesh.

Catching sight of the movement out of the corner of his eye, he turns his head long enough to see how many more he's picked up and... oh. It's just Firo.

Unfortunately, with a couple of them still latched on he really doesn't have hand free to wave. "Good afternoon!" he calls out happily, starting to hack at the one on his arm.