×Use at tunnel to go north, step directly SE with your sword pointing east, wait for one turn in order to let the golem behind you get one move ahead of the golem threatened by your sword. Now sidestep NE, turn around and sidestep SE and kill the golem. You now exactly have time to swing your sword so that it points south, and can step NE and kill the golem. You now have a free path east, and the rest of the room now isn't so tricky.