What he should have done is stay calm, very carefully pry out the nail, climb back down the ladder, and seek immediate medical attention. What he did was scream and yank his hand away, leaving a not-insignificant amount of flesh attached to the nail. Then he lost his balance on the wet roof, slid down it, and fell over the edge. He landed on the rocking chair on their front deck. Instead of this being an amusing slapstick moment, he broke his neck and died instantly, blood streaming out of his mouth.

