Adam had said that Blue was absent because he suddenly came down with a severe case of stomach ache. Whereas Winter had seen Blue struggling with his pheromones and looking as though he was experiencing heat.
There was something wrong with Blue and it seriously worried Winter. Winter had gone to the Kent house once again to see Blue. However, the creepy butler of the house told him that Blue no longer stayed there.
After receiving that information, Winter ran mad. He called Adam to hear from him, but Adam also wasn't aware that Blue was no longer living at the Kent house.
That was when Winter was forced to contact Oliver. It was against his assessment of the guy, but he still did it. Oliver had told him that Blue called him and sounded strange.
That was all Winter needed to hear before he began to intensively search for Blue. His search had led him to Blue's very own home that he had once been to.