Could see it either being the result of the other Medic breaking him during a particularly brutal interrogation, or yandere Medic. In the former scenario, the other Medic enjoys the attention and laughs about how pathetic he's acting, enjoying that he can say and do anything to him and he'll just take it on the chin. He'll even throw battles for his counterpart's sake. Maybe eventually the mindbroken Medic gets kicked off his team for how incompetent he's become thanks to his obsession, in turn gets taken in by the other Medic and kept around as a pet. In the latter scenario, enemy Medic is instead creeped out by it. Initially he agrees, he's great, he's a god, he's certainly better than him. But then the following around gets on his nerves, and it gets even worse whenever he tries to push him away. And then one day he decides to make him into a macabre art piece, kidnapping and restraining him in his infirmary and vivisecting him. Saying he's always wanted to see what was inside a god.