Moira is better at this than she let on. Not amazing, but no slouch, either. Granted, she has had more years of shore leave than these kids. She can't believe that someone as antsy as Max was signed on to train her. What did she do wrong? In this instance specifically, at any rate?
She knows that there's no way poor Cass can win with Max on her team, so, with a wink to Nic, she intentionally bats the volleyball toward the water. It's a mighty blow, and it "plunks" neatly. She laughs and runs for the water.
Oi! Ah guess that calls it! Last one in's in violation a' tha' Shoreside Treaty 'a '78!
This is, of course, a fake treaty often cited on shore leaves to mess with cadets.