Could she lure one away with the noise and then fake a senereo to the other. Like walk up to him in a panic that her *insert family member, child, eldarly mother, etc* is out on the street and needs help or that her or someone else needs to go to the hospital. While one's investigating a phantom noise she can get the other to call the hospital or something.

I'm not sure what sort of building you're talking about or the era you're working in.