I think the glasses man may not know the bomb exists. At the last minute, Bill told them the plane would be shot down by the ground if it ditched. The man with glasses was shaken and said I didn't want to die, and the black man beside him tried to tell him that we had a well-planned plan and everything would be fine. From this, it can also be inferred that when the people rebelled to capture Bill, and Bill told everyone that there was a bomb on the plane, the panic of the man with glasses might be true. Maybe he didn't know there was a bomb on the plane, so he rescued Bill from the crowd first, and at the same time freed himself from suspicion.
Immediately after, the black man was shaken. The moment he was about to defuse the bomb, the man with glasses shot him and decided to die together. Because if the bomb doesn't go off, they get to the ground safely, and everything is revealed, the show they've carefully planned will be meaningless. Even if they can parachute and escape midway, the public knows that it is a robber hijacking the plane, which cannot cause panic in society and security. So the plane exploded and caused a stir was the only way.
According to the vision of the glasses men, as long as they are not found, they can successfully create a sensation without being damaged, but because of the black men's bombs, even if they are not found, their lives are at risk.
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