"Several of Hafidah’s pursuers caught up to him. He was punched, kicked and stamped on, although witnesses remember the details and the number of attackers differently. Prosecutors alleged they were members of a gang and had intended, as a group, to assist in the killing."
And therein lies the difference, they all had 'intent' to kill him. You don't go to jail for murder just by happening to be out with somebody else who commits murder.
Thats just one example, plenty more on the interwebs

