That seems to do the trick. Beast Boy flips back into human form and gapes at Shu's moves.

"'I'm not good at fighting'," he imitates Shu's statement from earlier in an approximation of his voice. "If that's not good, I'd hate to see the guys you normally deal with!"

He's trying not to look at the U-Man they'd taken down. He... might be okay? Beast Boy has been kept out of melee combat as much as possible by his surrogate family, and the idea of taking another's life still horrifies him. Odds are good that multiple people have passed away from injuries he's given them, but at least it didn't happen right in front of him.