How to free the scientists from STAR Labs in Gotham Knights

To free the scientists from STAR Labs in Gotham Knights and survive the Regulator attack, you need to operate the Railgun at the same time to thwart Mr Freeze.

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I keep getting this on the STAR Labs mission and can't finish the fight, any known fixes? (Yes my drivers are up to date) : r/GothamKnights

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