In recent instalment 'The Bullet in the Brain', the Fox drama introduced sniper Jacob Broadsky (Arnold Vosloo), a former ally of Booth (David Boreanaz) who has become a cold-blooded killer.
Stephen Nathan told Entertainment Weekly: "[In the March 10 episode] Booth is truly determined to go after him... but also is struggling with the demons that come along with being a sniper himself, and wondering how Brennan sees him."
Nathan added that the episode will see Booth consider "if Brennan thinks that he's the kind of guy who can easily pull the trigger, or if she knows how difficult that is for him as well".
He continued: "It's forcing him to look into an aspect of his life and look into how other people perceive him as well."
Nathan previously confirmed that the sniper storyline "is going to hang over [the show] for the rest of the year."
Bones airs on Thursdays at 9/8c on Fox.