In Twins (1988), first Professor Mitchell Traven denies knowing anything about them, then changes his mind after they break through the door.
Why didn't he have them taken away by the security guards who came in?
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Because they frightened him.
You can call guards in to take them away and they might actually manage it(!) but what happens when you leave work? You will not always have guards to protect you, who knows how far these two will go? Who wants to find out too late that they are lunatics with a basement, a gag and a blowtorch?
It is much easier to just give them what they want and let them be on their way.