Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: At 1:27 of this clip from Pearl Harbor (2001), Japanese bombers are flying over teenagers somewhere in Hawaii playing baseball. The Japanese machine gunner then gestures his arms vertically, but why? He doesn't appear to be waving as a greeting.

A: What's this Japanese bomber machine gunner gesturing with his arms?
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Q: In Ex Machina, If Caleb had already reprogrammed the security protocol, why did he attempt to get Caleb drunk again? Or perhaps Caleb tried to get Nathan drunk again because he thought that Nathan had been listening in on his conversations with Ava during the power outages, and thus Nathan would have been expecting Caleb to try to get him drunk, and to not do so would have made Nathan suspicious and possibly led to the whole plan to free Ava to be foiled?

A: Why did Caleb try to get Nathan drunk the second time?
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Q: In Mission: Impossible - Fallout (2018), Ethan Hunt's team already strap a tracker block on Lane's neck which makes the tracker device to show "no signal". Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?

A:
Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?
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