Play it off

Tim's needed to think fast. If she disobeyed Brainiac, he'd wipe her mind for being defiant. The only reason she still had free will was so he could test her loyalty. She had to play this carefully. John Constantine knew Zatanna better than anyone. He'd figure out she wasn't the girl he was in love with sooner or later. Tim could use that to her advantage. Instead of behaving as Zatanna's mild mannered, friendly self, she'd act... different.

"I'm busy, John!"

"Zatanna" moved to pass him but he placed his hand on the wall, blocking her.

"Now what's crawled up your ass and died, love?"

"Nothing."

Tim narrowed her eyes at him.

"Really? Nothing, eh? Then why were you makin' a beeline for that server room?"