First of all, Johnny was justified in killing Bob. It was in self-defense, the Socs beat up Johnny before traumatizing him, and the only reason why Johnny had his switchblade was because of the same Socs who tried to kill Ponyboy. ... Because they drove Johnny and Ponyboy away, by forcing Johnny to kill Bob.
4. Believability and confidence. The more confident you are the more you grab your audiences attention. The more believable your presentation is the well more your audience believes it.
