Plot summary
Because of his dealings with Natchios, Murdock is late for Castle's trial, and Nelson steps in for the opening statement. Unable to use a PTSD defense from Castle's time at war—Castle believes it would be disrespectful to real PTSD-suffering war veterans—Nelson instead focuses on Castle's family being failed by the justice system. Murdock works with Page in preparing to cross-examine the chief medical examiner, who likely doctored the Castle family death certificates for Reyes, but before he can do so in court the man confesses; he had been tortured the night before into revealing the truth.
Murdock realizes that Natchios had overheard him and Page and attempted to "help", and reveals his involvement with her to Nelson. With the examiner's testimony now invalid, Nelson's relationship with Murdock fractures. Murdock confronts Natchios, who agrees to stay away from the trial, before joining her in searching an abandoned building site from which the Yakuza ledger revealed shipments of dirt. Inside they find a giant hole.
Credits
Adapted from Wikipedia contributors, Daredevil season 2. HTML formatting and reference markers removed.