Jon was at the end of his rope, but it was at that very last moment when he pulled the trigger.
There was a high-pitched noise, as there was before, and he was back to normal, wearing a T-shirt and blue jeans. Part of him thought that he'd never be back to normal, so that part was immensely relieved at this outcome.
Now to change the others back to normal, Jon thought to himself, standing up with the device in his hands.