How I Would Fix/Ruin - Unbreakable

One of M. Night's best movies, excited about the spin-off/sequel, which would not be possible if it had gone this way. I have watched thousands of movies, and usually figure out the twists, before they happen. I thought I had this one figured out for sure. He tells Mr. Glass that he did almost die, when he was a kid, at school, in the swimming pool. I expected Glass to use that information, later, against him. When he confronts Glass at the end, I thought that SLJ was going to say, in his final speech, that his whole mission was to find Dunn, and kill him (thereby proving the villain was superior, intellectually, though weaker physically). He hits a button on his wheelchair, and a trapdoor opens under David, and he falls into a full tank of water, and Glass hits the button again, to close the soundproof lid, and rolls back out to the party....