Ezra wasn't just looking for Garth'zel, of course (though that's what he'd claim he was doing if asked). Every room he's come across, he's poked his nose in and explored, getting to know the layout of the ship and what might be in each room. Garth'zel's probably had plenty of time to read before Ezra finally finds the room he's in.

"I finished," he announces before even crossing the room. Then curiosity prompts him forward. "Whatcha reading?"