"QUESTION: If D1 and D2 exchange gun fire, each intending at least to cause the other really serious bodily harm, and one of D1's shots hits an innocent bystander, V, what are the circumstances in which D2 would be criminally liable for the injury to V following the correction in R v Jogee[2016] UKSC 8 ;[2016] UKPC 7 to the wrong turn taken in the law on joint enterprise that prevailed at the time that R v Gnango[2011] UKSC 59 was decided?"