It's clear without having to sound out any dumbass questions that Sol doesn't recognize him - Bruce didn't expect him to after a cursory network investigation when he first arrived, but he also didn't expect to be this irked by it in person. For a moment he just looks at the other man, the critical familiarity plain for a heartbeat before it settles back into his default blankness. He makes a monosyllabic noise that passes for a greeting in return, and then just... keeps walking, because what the fuck is he going to say, otherwise. Best to just move along.