If you pay close attention to the walls you'll see a purple crack, just walk closer to the walls closest to your camera/make sure you have 1 space of distance between you and the crack to avoid them. One strat you can use is [Check Weakness] followed by either [Sword Toss] (to hope for a possible stun) and rely on its weakening effect OR double your next sword attack power, depending on which you do you can waste the turn grabbing your sword (unless you have the item that gives you a 50% to act twice), use the skill to double your next swing and slap the shit out of it with a [Double Strike]. The name of the game when playing as Journey is equip the highest damage beat stick you have, spam either stun or double the attack power of next strike free use skills, then go ham with either double strike or sword toss. One reason the Glacier Sword is so good is that if its effect procs on the first supped up double strike hit then the second hit will do even more damage due to the enemy having reduced defense values.