[@Caits][@Archmage MC]
Hey, sorry if I'm butting in, but I just thought I'd throw in my two cents again. Correct me if I'm wrong, but I believe that what Arch is saying is that Light will only observe the fourth when Deadpool breaks it, in a matter of speaking. For example, say Deadpool's kid breaks the fourth wall. Rather than having the normal reaction of confusion, I could see Light observing Deadpool's fourth wall break, saying something that hints at her having that kind of knowledge as well, and, at most, the two might have a short, humorous conversation that other people would just see as two mental patients babbling. The fourth wall is breaking no more than it would if it were just Deadpool.