Outsiders Debate Paragraph- Defence Attorney

On the night of the crime, Johnny Cade and Ponyboy Curtis were at the park late at night. Bob and his gang were in their mustang when they saw the two boys. They pulled up and proceeded to taunt and tease Pony and Johnny, the two boys back rattled and Bob and his gang started hurting Pony and Johnny. They took Ponyboy and started drowning him while they were beating up Johnny. Then, Johnny stabbed Bob, but heres where the argument comes in, some think that Johnny acted out of self defence while some think it was voluntary manslaughter. I and the rest of the defense attorneys believe that Johnny acted out of self defense, not voluntary manslaughter. Here are some reasons, with evidence on why