On my first attempt at this boss fight, i was using Moze’s Iron Bear. Wendigo was jumping from the cave ceiling and i hit him with a few V-35 Grenade Shells and he fell to floor with half of his skeletal mesh through the floor. Then he slipped through the floor and continued falling. Ultimately i had to kill myself and respawn to try the mission again. Just a bug, maybe you need to take away his hit response while he shaking the ceiling so he doesn’t accidently fall off while its hit by iron bear.