[cones688]

Arrived slightly later and not known who the perpetrator was or have admissible evidence to that effect. The guy had already run away onto another street - it's likely he wouldn't have been caught.

It also very much changed the officer handling us behaviour I would imagine, as usually in such brawls they detain everyone then get he said/she said stories. Instead he knew the guy had run across the street after we hadn't even acknowledged him, so knew my friend was the "victim".