"The prosecution say that this was a joint enterprise attack on Mr Bowden. Different people may have taken different roles. Some kicked and stamped on him; at least one, probably two used bottles on him; others who may not have been involved in the bottling may have bundled the victim off the train, forcing him to the floor where he was set upon by some of the others; others may have been there, knowing what was to happen and, knowing what was happening were willing and able to assist if necessary, thereby offering encouragement and support for what was happening."