They act normally. The unit inside the land raider wasn't locked in combat - the land raider was.
Some transports, generally open-topped ones, do have a penalty for their occupants if they stay inside the vehicle that falls back.
But seeing as how disembarking happens before movement, and therefore before falling back, there's no penalty for the passengers.
Do bear in mind you have to follow all the disembarkation rules and restrictions, and can't disembark if the vehicle is surrounded. But if there's room to deploy, there's no reason your dudes can't get out and act normally while the vehicle falls back.
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