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In the Rock when Sean Connery is leading everybody into the island, he rolls through the spurts of fire because he "memorized the timing." Then once he gets in, he opens a door to let the rest of the team in.

Why would he have learned the fire timing when he could have just opened the door and walked out in the first place?

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At the time it was a fully functioning prison, which would have had guards, electronic locks, generally a much more secure area. No way to just stroll out.