you were the new espada, 7th espada. Aizen had told you to go explore the area for the day since you were new. You were walking, you had bumped into Grimmjow, which he was a higher number so he could easily kill you. He was about to hurt you when Ulquiorra the 4th stepped in between you to stop his cero.

Ulquiorra: stop that Grimmjow, leave the new espada be. his voice cold still

Grimmjow: glares at him tch! Fine… he walks away, quite pissed off… something tells you he’ll be back…