When Howard Keel rides past the two natives in the small truck with the bath tub in the back. The first look is as he approaching the truck and the tub can be seen riding intact in the back of the truck. After he passes the truck the bath tub now looks in rough shape. And it now seems to be wobbling like it's missing a leg. And when the scene is viewed in slow motion. The tub come apart in mid-air. It didn't seem to have any reason to break yet. It hadn't hit the ground yet.