The traces are there to be found. He's definitely not dead, and not in that much distress, even if his emotions do vibrate with frustration, worry, and stress. There may still be some alarm, though, when the trail leads Garth'zel to an Imperial compound.

Inside the compound, Ezra yells and kicks at the door to the room he's been locked up in. "You better let me go!" he shouts to whoever might be listening. "I didn't do nothin' to that guy at the stall! When my dad finds out I'm here, he's gonna be mad! An'- An' you'll be sorry!"

Deep down, though, he's the one afraid here. What if Garth'zel thinks he changed his mind and leaves because Ezra never showed up?