My reflex would have been to say that they can't escape; not their turn, they can't move from hex to hex.
But then Rob and Jamie decided to throw in this 'units can move into a battle in progress' stuff, counter to most turn-based game rules, so that blows any movement predictions. It was done for story purposes; makes no sense from a gamer perspective.
Not to mention all the uncroaked and Sizemore's crap golems.So the Tool is down to 3 (maybe) warlords, or possibly only 2, the B-dwagons, and the gobwins of the Knob itself. We really haven't seen them do anything, so this fight is far from over.