Moral Event Horizon: A double whammy in "Fifi": First Chuck torpedoes Kim's attempt to take her recently landed big client with her when she leaves for a private practice, just because she'll be working alongside Jimmy. This marks the first time his efforts to stop Jimmy's law career have serious collateral damage, which he doesn't seem to care about at all, and it's made worse by the physical hell he puts himself through to do it. Jimmy then retaliates by slipping the client's paperwork out while Chuck is suffering the severe effects of taking that meeting without any of his usual precautions, and spending hours meticulously altering a single address throughout all the papers. While intended just to make Chuck look bad, it could also have a huge impact on both HHM and the client.
Maybe a triple, since Chuck does this because Howard lets him think Jimmy and Kim are partners at law, when they aren't. Howard is quite willing to do damage to Kim and Jimmy and to let Chuck exacerbate his condition if it means keeping business for the firm.
This doesn't serve as a moral event horizon. Chuck maintains the moral high ground through this event and afterward.
Removed:
This doesn't serve as a moral event horizon. Chuck maintains the moral high ground through this event and afterward.