Clarification: the men in suits already entered the building with the rats. They are walking down the hallway to the art exhibit room, so helpfully indicated by signs. They pass by Melanie, hiding in the dark.
Dirt Nap can locate Mable and Twist, and that the area is dark. It's likely that a dark corner will provide cover enough as the flashlight phone are in the hall and by the front doors.
The mortals are impacted by complete darkness, using cell phones to watch the rats crawling over their shoes and swarming the hall. Walking is impacted to a walk by the sheer amount of rats to walk over and bypass.
There's two exits: the front glass door and the back door with the mental screen. The ghouls are walking down the hall from the front door. There is no sign of a beast.
In fact, they direct powerful flashlights down the hall. One, the blonde, carries a semi automatic pistol on his hand. The second has a pistol visable in a holster at his waist.
Rosario is startled at the shove, but says quietly " Simone said to give you the painting..? I could go with you, I guess..," He does not resist, but he is not using any apparent supernatural abilities. He adds a -1 modifier to athletic/ foot chase rolls. He also appears to not be able to see, which adds mobility issues unless someone provides a light for him, which would likely indicate their location to the approaching men, men Melanie has hidden herself from.
to scan the ghouls for other weapons, or foot chase out of the building to the back door is possible. Phone post, apologies for formatting