Mr Light wrote:

Just because we see Bats in the cockpit right before the detonation doesn't mean that shot took place a second before the detonation, they could have been playing with the timing of the shots to mislead you.
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True. More time could have passed between that shot and when the movie switches back to the perspective of people in Gotham...
Although even with a lead of
20 or 30 seconds, that still wouldn't be enough to survive a blast like that.