While she doesn't know what half of this.. human stuff is, it hardly takes a Peridot to figure out that the thing being pointed at her is dangerous. Granted, the thing she has on her person is also dangerous, but she had hardly been ready for an ambush like that.

The blue girl doesn't even bother reaching for the plasma gun on her. She doubts she could do it fast enough to get a shot off before being shot.

"... Feel like pretending we never saw each other, then?"

No one ever said Lapis was the bravest or the most fearless gem.