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Subverted: Joe promises not to press the button...
Double Subverted: ...but when Bob has his back turned, Joe presses the button anyway.
Parodied: Joe nobly presses the button. It's not working.
Zig Zagged: Joe is about to push the button when Bob presents a thoughtful Patrick Stewart Speech on the meaninglessness of such a gesture, a noble person who cared about his fellow man would never use his last bit of life to spread more destruction. Does Joe really want his legacy to be that of a monster who destroyed that which he could not beat? If Joe believes himself to be such a monster, then, well, Bob admits he sealed his own fate just by defeating him, so, with finger over the button, what kind of person are you, Joe?
Joe dies without doing anything.
No one dies.
Joe doesn't die. Bob on the other hand...
Enforced: "Bob and Joe are lowering our show's ratings. Let's have them fight, and both be destroyed by Joe in the end!"
Lampshaded: "Just watch. Just when we think he's dead, Joe is going to try to take us out in an explosion."
Invoked: "You think you may have won Bob... but like all good villains, I'm Taking You with Me!"
Exploited: Charlie, Joe's partner-in-crime in a Teeth-Clenched Teamwork, knows that Joe is a Sore Loser, so in hopes to dispose of Bob, a powerful mutual enemy, he deliberately arranges so that Bob will storm into Joe's base and beat Joe, causing Joe to blow up said base in an attempt to kill Bob, at the same time helping Charlie by removing Bob from his plans.
Defied: "Don't worry, Joe can't do anything. There's no way he can reach the button before he dies."
Discussed: "Haven't you noticed how whenever the villain is dying, he attempts to kill the hero in a blaze of glory?"
Conversed: "Did you see that explosion from Joe's base? He must have been trying to take Bob with him!"
Deconstructed: Joe killing himself would have destroyed Bob, but it'd have opened the way for a bigger danger to appear which wouldn't be able to be stopped because Joe was dead.
Reconstructed: Joe manages to kill himself and destroy Bob in a way that makes any latent danger unable to appear.