Cast command on the sentry!

“Gonna use a wee trick our cleric taught me.” You whisper moving forward.

“Waddya gonna do, pray him to ****?” Bax says snarkily.

“That’s closer to the truth than you think.”

You stand just on the edge of the torchlight produced from atop of the palisade. You look up at the orc and focus your mind on dominating his mind.

You use your hands to mimic the magic gestures taught by Petra and a sudden lash of magic sparks up towards the guard. You see the spell make impact as the guard stumbles slightly, then proceeds to stand motionless waiting for its command.

I’m in his mind… this feels alien. Need to utter a command that will shut him down… What could I say here?