Understood about the bridge. Although I wouldn't want to be left with no HP, we can recover in the next few turns. If they shoot, cover him with a shield so he doesn't get completely roasted by the sun.
I think we should slowly move our archers towards the right wall, as it's safer there and the enemies have less room to maneuver, and continue to shoot down the archers. I would suggest stunning Tessar one more time with Vilinlia, so he doesn't revive in the next turn, and damage him together with James at K1.