Inflated feelings of self-importance aside, she needed to get to Biff's house without anyone seeing her. She could get help there. She'd been hiding behind some garbage cans for about five minutes, catching her breath and trying to calm herself.
One hand covering her sizable breasts, the other her privates, she started to run the last block to Biff's house.
As she approached, she saw a shimmering distortion in the air in front of her, next to Biff's house. As she approached, she saw it move backward, and it now was about a quarter of the depth into his house. She approached it, cautiously.
She hadn't seen any cars or people since she'd started running, so she felt safe enough to slow down, making slow, cautious movements to hide behind the garbage cans, next to the side door, which let into the kitchen. She reached out and tried touching the distortion. It felt like a solid barrier, but through it, she could see a nearby squirrel. It ran through the barrier, but when it turned around and tried to go back, it was prevented. Clearly, the thing was one-way only, but what was it?
She opened up a nearby garbage can and found an old can and threw it at the barrier. It flickered, then bounced back. She tried the door to the house, and found it locked. She tried knocking loudly, then hid behind the garbage cans.