in English law is R v Swindall and Osborne (1846) 2 Car. & K. 230. Two cart drivers engaged in a race. One of them ran down and killed a pedestrian. It was not known which one had driven the fatal cart, but since they were encouraging each other in the race, it was irrelevant which of them had actually struck the man and both were held jointly liable. Thus the parties must share a common purpose and make it clear to each other by their actions that they are acting on their common intention, so that each member of the group assumes responsibility for the actions of the whole group. When this happens, all that flows from the execution of the plan makes them all liable. This is a question of causation, in that oblique intention will be imputed for intermediate consequences that are a necessary precondition to achieving the ultimate purpose, and liability will follow where there are accidental and unforeseen departures from the plan, so long as there is no novus actus interveniens to break the chain. Until 2016, in cases where there is violence beyond the level anticipated, the prosecution had to prove: In R v Jogee [2016] UKSC 8 the UK Supreme Court decided that (c) was wrong, and that the prosecution actually had to prove that D had intended to assist A to commit the crime, and this normally meant (but did not have to mean) that D intended A to commit the crime. Deliberate departure Where one of the participants deliberately departs from the common purpose by doing something that was not authorised or agreed upon, that participant alone is liable for the consequences. In the situation exemplified in Davies v DPP [1954] AC 378, a group comes together for a fight or to commit a crime, and either the participant knows or does not know that one of the group has a weapon. If the person knows that there is a weapon, it is foreseeable that it might be used and the fact that the other participants do not instruct the one carrying to leave it behind means that its use must be within the scope of their intention. However, if the person does not know of the weapon, this is a deliberate departure from the common purpose and this breaks the enterprise. When the outcome is death The simplest form of