Predator 2 (1990)

Plot hole: When Harrigan and Captain Pilgrim leave the head Captain's office after being told not to impede Agent Keys' investigation, Harrigan then spots Keys and goes and roughs him up, shouting and generally making a nuisance of himself. Pilgrim was only just behind him. Harrigan's actions have caused everyone else to be quiet, so it's not as if Pilgrim doesn't know that Harrigan isn't manhandling Keys, yet he does nothing to intervene, especially in light of the meeting the pair of them just left.

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