Bug In NPC ?

While doing the Attack the Kurzicks quest outside Gyala Hatchery the luxon priest ran down the beach and started healing the Kurzicks I was trying to kill. Then he just stood there. I couldn't attack him so I thought it might be a bug. But really.. Its not a big deal but maybe if one of the ANET team see this they can stop your allies healing the enemy.

Or maybe my team was so well set up they thought they needed all the help they could get !