Kai was one of the main group members of the Howlers. He was pretty much second in command to everyone after Gary. In some cases, many saw him more as the leader. On top of that, he was one of the first to have been turned into a werewolf.
In the past, he and Olivia used to train on the side, as Kai knew how important strength was in his position. He didn't want what happened to him when he had been beaten by Midwak to happen again.
However, as time went on, Olivia started to focus more on her relationship and her strength with Marie, leaving little time for them to train. Instead, he had occasionally been secretly meeting someone else.
As Kai's body transformed, it didn't turn into his werewolf form. Instead, he transformed into a light grey-furred wolf that sprinted across the tracks. Then, he leapt up, and Gil, in his altered form as Anbus, could barely react. He swung at the wolf coming towards him, but the wolf form was agile, moving him to the side.