The broken glass tells me that maybe someone got in without the key

what with that grey stuff that surrounds Ochaco's arms, and Toga's right middle, and pinky finger?

VioletMinde said:

what with that grey stuff that surrounds Ochaco's arms, and Toga's right middle, and pinky finger?

That's the visualization of tingling sensation you'd have when something presses on your limbs for a long time.
Which implies Toga's fingers was stuck inside something...tight for the entire night, judging from the wetness.

VioletMinde said:

what with that grey stuff that surrounds Ochaco's arms, and Toga's right middle, and pinky finger?

More specifically, it's TV Noise/Static.

This duo never get's old