I can confirm this mob did not summon and was snareable. Also the other orcs didnt seem to assist when I pulled him. He just dropped some trash for me a fine steal longsword and a binding powder thing. Nothing of real use or worth :(.
This fellow does not summon but he ported away from me at about 75%. I still had him on target but he was nowhere to be found on track and I didn't have aggro.