'Are we sure that this defendant took some part in the fatal attack on Mr Vincent either by: (1) himself unlawfully assaulting Mr Vincent and causing him fatal injuries, intending to kill him or cause him really serious bodily injury; or (2) participating in some way with another or others in a deliberate plan to kill and that Mr Vincent was killed as a result; or (3) participated in a deliberate plan to assault Mr Vincent in which this defendant intended to cause him really serious harm and that Mr Vincent was killed as a result, subject, again, to the one point?'