Accepting an offer to take a later flight happens all the time, but it is not “getting bumped.”
Getting bumped is being removed from a flight against your wishes.
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Well, that’s what happened to the three passengers that left the plane without incident. The four in total were selected randomly after nobody accepted the offer.
The 4th was the assaulted passengers wife so no, not really without incident. She followed him out after they assaulted him.