On your video have a time between he disappeared and you showing his place (like a ~18 sec). So, we have a doubts about hack, thats why we didn't answered in your report.
I watched him in the game for about 2 days and nothing. All the time he uses a vanish and run to the teleporter (tp in SW and then go to Elwynn forest for reset CDs).
If you have another proofs, make a new thread.