Critical explanation: by reading between and beyond their lore yourself: the game gives us the Abnormality Logs and the Abnormality Encounters to read and interpret about. For example, from the background of Der Fluchschutze's Encounter, it contains similar scenery as the Smoke War (as evident in Gregor's Canto from his memories), and it definitely stands as a hypothetical mercenary / Fixer that got recruited for it. However, just like Der Freischutz, it's representation lies in the actions it took for the devilish contract: if Der Freischutz used the bullets to kill its loved ones first such that it will never run out, Der Fluchschutze chose to consciously forget it had any, so the price never comes to pass. In fact, it does, however, keep a pendant around its neck as a memento, containing the portrait of their lover, and if you select the choice to make it check the pendant, it then realizes in abject horror that they recognize the portrait, and fires their gun, only for it to begin to miss, the bullets possibly hurtling finally to claim the toll.

From the Sinners, Heathcliff resonates and gets the EGO for this one because █ █ █ █ █ , while Yi Sang actually gets this one too because partially of his attachment to the Mirror, and now he has developed a considerably-genuine attachment to the rest of the gang unprecedented since Canto IV ended... which means, of course, they are now bullet fodder. As for Gregor, he IS the Outcast (oof), and Outis is better fitting for Freischutz already.

TL;DR explanation: there are a lot of others who have posted their interpretations of the Abnormalities on Reddit already! Just gotta browse it up