I saw the video more than a couple of times. When the doofus picks up the pistol, his finger is inserted into the trigger guard. He then tightens his hand to grasp the pistol, and that’s when the round is discharged - his finger has complete access to the trigger and his hand is being tightened. Conclusion: he pulled the trigger.
Dork.
Seems like the bureau is giving him up. Otherwise they would have fixed this with the local authorities and shipped him back to DC. Probably has a rep as a clown.