Everything goes wrong at the fountain. When Johny kills Bob that is when they are forced to run away and Johnny is badly burnt. "We got to get out of here. Go somewhere. Runaway." pg 57. If Jonny doest kill Bob neither he or Dally dies. If Johnny or Dally doest die Phonney boy never loses anything.
At the church is when Johnny is badly hurt. "He might have broken back and he was burnt pretty severely." (95). This is why the church sceene is very important. It makes Phoneyboy worry about Johnny a lot more. As well come to terms that his freind might die.
When Johnny dies it affects Phoney boy in a pretty big way. "Johnny is dead. But he wasn't. that still body back there wasn't Johnny. Johhny was some were else." (150). As you can see Phoney boy refuses to accept Johnny is dead. Johnny also had Dally get himself killed witch pretty heavily impact Johnny.