Hulgyr suggests to ambush them form two sides: The whole party in the front to confront them, and him at the rear to prevent them from escaping and attacking them from behind.
We'll wait untill the front party can launch thier attack (fairly from the front, not the side so to block thier path) and right after that, Hulgyr will close the gap in the rear and attack from there.
We'll wait untill the front party can launch thier attack (fairly from the front, not the side so to block thier path) and right after that, Hulgyr will close the gap in the rear and attack from there.