Ahehe, well, it's explained on one of the explainations of one of the pages ...
Fire's father Orachiu, killed Oreo's father and his mother went missing: her blood was later found in a lake by pack members. But Orachiu killed them because they were the alphas and he had a grudge against Oreo's father; it's also worth noting that Oreo's father, Palsi, was Orachiu's brother. Palsi was chosen to become the next apha, and to top it all, he 'stole' the wolf at Orachiu's fancy, which is Oreo's mother, Kapile (Cape-ill).
He killed Palsi and Kapile because he wanted to be Alpha and, origionally, he would take Kapile to be his alpha female, but when she refused to come with him, he drowned her. So he wanted to blame their death on someone else, someone close to them, with fiery courage, and sharp claws ... that could only be Oreo!
So, When Fire was waiting for Oreo in the clearing, Orachiu came up behind him and before Fire could tell who it was, he was unconcious to a small wound in his throat, that could easily be healed.
So Fire (or Terror) would be brought up to believe that Oreo had almost killed him, where as it was actually his father. He was practically exiled by Fire's father because well, a bit like in the Lion King, but with both of Oreo's parents. C:
Indeed D8
And thanks <33