Araña doesn't have anything fancy like "thermal scanners", she just has to be alert. But she noticed, from her perch on a nearby rooftop, that there's a commotion in that shop below her, and decides to check it out. She in full exo, not even a flash of skin showing, and more than a little freaky looking.

If she was paying a bit more attention, she might have noticed the other figure closing in when she did, but instead she just drops down into a crouch right outside the door with an unknown quantity coming up behind her.

(Nina would say she's getting sloppy)

"Cinco contra uno..." she mutters under her breath, readying herself to bust in. "I can take five."