Agent McCall is in town to acquire evidence in an impeachment case against Sheriff Noah Stilinski. He didn't tell either Melissa or Scott that he was coming to town, and neither are happy to see him. 

After Scott learns about the impeachment proceedings, he calls his dad over to the house to demand an explanation. It quickly escalates into an argument. Agent McCall defends himself by saying that he was just doing his job. Melissa sides with Scott against him.  When Scott starts getting too angry, Melissa pulls him away before his father can see him start to transform. Agent McCall looks curious as to why she pulls their son away so suddenly.