Frankenstein saves a drowning girl,and gets shot.The sentence pretty much speaks for itself, Frankenstein had just felt relief on the earth,by its rays of sun and cooling breeze,no feelings of revenge,his grudges just vanished!But then he saves a girl,and the guy shoots him in his shoulder,and thats what fueled him to be angry,I think what fuels him to get revenge is the fact that he felt more pain than ever and it was physically,and the other thing that fuels him was he felt that the De Lacey family were his protectors and I guess the way they reacted to him is what he thought of and thats what makes him mad.If i were the creature i'm pretty sure i would've done the exact same thing and felt the same way.