An audible snort, but he doesn't turn to face the hedgehog. Fists just keep striking at thin air.
"Training, what's it look like?"
Knuckles the Echidna
[Liiiike right now.]
'Sup, Knucklehead?
- SONIC ꭲꮋꭼ HEDGEHOG ! ミ★
Stretching his limbs, punching the air a few times. Gotta stay active, you never know when some troublemaker’s gonna try and start something.