A Sudden Realization
They were confident that the scent of non-threatening and threatening things had been trained to be distinguished by Kyle, which is why they were puzzled as to why he was behaving as such. But then, there was something they remembered, which is why instantly something clicked!
An Orchestrated Crime Scene
Smith was the first to have taken those together. He recalled that Kyle had really wanted to see John. His latest behavior revealed isolation symptoms, and there was a loss of his closest friend and former girlfriend. He was conscious that after his police intervention, John was going to flee.