He took them to a room. They saw Hans, from Frozen, stabbing animatronics with a sword. Until he noticed the four, Oswald told them and showed them how to fight. After having a quick sword/keyblade fight they saw a glowing lime colored ball of poison go right through Oswald as he collapsed to the floor. They got him up and took him to one of the medics. They exelled in medic class back in school so they knew how to handle this. But it was too late.