[Petra follows easily, that tug indicating Hilda's urgency and spurring her to keep up, stay close. She does not part from her friend, nor does she pull away for the sake of investigation, though she does turn to sweep her narrowed gaze across the alleyway.

Hilda is exactly right. It looks completely and utterly ordinary; any kind of struggle would have left traces of some sort, especially one as intense as Hilda had described, but there's nothing— nothing apparent to the naked eye, at least.]

... they are covering their tracks.

[Of course they are.]

It is making sense, with how they have been going undetected until now. If someone got away from them to tell the tale— they would not want to be leaving anything behind as evidence, but even at their most careful, I would expect to find something. Blood, debris...

[Anything.]