Question on the Ending (SPOILER WARNING)

Actually, Palance grabbed the wire to keep Chandler from pulling the fuse out. You can see him struggling for a good while to hold it. Chandler finally gives up, and comes back down from the safe area to basically commit suicide. When Palance said they could do it by working together, and offered to stay behind, I think he was giving Chandler a chance to redeem himself, morally. When Chandler tried to kill him in a sneaky way buy pulling the wire, instead of going to get the tools, Palance realized he was irredeemable, and left him to his fate. Chandler had put up a swaggering, macho front to everyone around him, especially Palance, and himself. He couldn't live with the fact that Palance, and now, beyond any possible doubt, he himself, knew he was a true coward. Instead, he chose a "heroic" death. That is why he came back and just let Palance walk away, while saying something along the lines of "I guess it is still my bomb." He and Palance knew death was his only way out. Chandler was too much of a coward to face being a coward.

Great little movie. I really enjoyed it.