There are only two people inside, and they haven't noticed Jimmy outside. Entering directly through the window would be an ambush, which doesn't fit the FBI's protocol. No matter what, the FBI is openly federated police and must have procedures when operating.
Jimmy glanced at the surrounding houses; it's not too late now, people are still moving about in each home. Because it's a residential area, there aren't many cars on the road, and there's no immediate danger from behind.
Jimmy held his FBI badge in his left hand, a Glock in his right, and knocked on the door.
The people inside hesitated for a moment, looked at each other, one pulled out a handgun, while the other also took out a gun and approached the door.
Jimmy, seeing that the people inside weren't speaking, directly identified himself: "FBI, open up."
The person at the door immediately raised his handgun, while the one behind grabbed Elliot, aiming a gun at the doorway.
Jimmy: "Open the door, I know you're in there."
