It looks like the bucket peeled from the seam and flew off opposite him, so maybe his leg was damaged by supersonic ice. To his credit, he had on a welding apron, goggles and what look like MIG gloves, so he's not brainless. He just failed to consider all of the failure possibilities. He seems to have learned his lesson and has a sense of humor about it. This is in his list of damages: "5. Bucket will not hold water anymore.".

Neil