Officer Sebastian passes the same girl waving at him from her window every day on his patrol. He therefore simply knows that something is wrong when one day this is no longer the case and breaks every rule in the book to investigate. He finally receives the answers he was seeking when he eventually makes it into her room, but he was immediately unsure of whether he still desired them.
Calling for backup
Sebastian realizes that something is wrong when the door is shoved in his face. No longer concerned about maintaining his good reputation with the bureau, he does this anyhow. He calls for backup to come and search the house since he’s willing to take a risk.