Dude, Orihime is SO in trouble now. Grimmjow said that beating up those two arrancar that were picking on her was paying back his debt for her fixing his arm, now he doesn't owe her anything so he gets to do what he likes. Baaaaaad news.

And I think that was just a cero he fired, like all the arrancar can do, though I don't recall if we'd seen Grimmjow use it before.