Marcus and Noah were walking home one night when they were confronted by Oliver and Perry. An argument developed during which Oliver took a knife from his pocket, stared at Marcus and began to move towards him. Marcus ran off, followed by Oliver. Realising that Oliver was catching him, Marcus tried to run across a busy road. He was struck by a lorry and killed instantly.
Oliver returned to find Perry attacking Noah with a baseball bat. When Perry dropped the bat, Noah punched and kicked him. Oliver picked up the bat and used it to strike Noah four or five times about the head. Oliver ran off, leaving Noah unconscious. Perry dragged Noah to a nearby hospital, dropping him three times on the way. Noah died in the hospital the next morning.
Consider the criminal liability of Oliver for the manslaughter of Marcus, and for the murder of Noah.