Bump it...? Enoch looks at Gamzee's fist, then his own hand. Well, it's not like bumping it with anything but would be practical or make sense.

What an odd greeting gesture, though, he thinks as he lightly taps their knuckles together. Was it only for sparring? That would make sense, a lighthearted mock-punch to a good spar.

"I'm sorry, I'm not familiar with this gesture."