Watch the last second and a half very closely: the guy who has been manhandling the chick shoves her down the stairs. This recontextualizes the whole thing: the two "men" are actually pusher / shover robots, trying to protect her from the space robot and the secret it wants to share.
That robot was totally cool about this. Dude had to really annoy the robot multiple times before it said "fuck it" and blasted him. It was willing to deal with the inconvenient chase after letting him live the first time, but was not going to do that shit again, and especially not up no ladder.