User blog comment:Ozzieguy74/“Sequel” episode to Brawl in the Family/@comment-31563773-20171104140135

My headcanon is that the SFP was just made and this episode was the first time it was put into action. However, Lincoln wasn't made aware of it since the girls either felt he wasn't prone to conflict like they were, or neglected to tell him (may be the former since he's been told repeatedly that he 'wouldn't understand'). And the system itself was flawed since while they wanted to keep Lincoln out, they kept indirectly getting him involved.