.... ehhhhhh I dunno about that dude... alright
I'll just say that I still have no clue about most of the things that weren't revealed yet, so I won't draw concrete conclusions, but as it is right now, this doesn't feel right to me at all. Essentially it feels like the narrative was contrived and forced in order to lead Battler to make a logic error, heck it feels like a straight up plot hole:
-- The player suddenly has the ability to retroactively change his behavior without the knowledge of the game master: Erika (1) retroactively set the chain on Battler's room and (2) retroactively killed the other 5, even though Battler only allowed her to retroactively set tape seals. I'll give you that setting a retroactive tape seal on the door instead of on the chain should be allowed but that's not what she did, and Battler's outside help trick specifically relied on the chain and not a tape on the door.
-- Even if I give up and accept "Erika could retroactively change all of her behavior since getting the packing tape", then when Erika announced her retroactive tape seals after she observed the letter, Battler had the option to retroactively revise his script in response and remove the letter, but suddenly her other retroactive changes don't give him that option anymore, forcing him to have a contradiction.
-- Erika had to go to from the guesthouse to Battler's room to observe the tape seal she put there and check if it's broken or not, and Battler could revise his script (the status of the tape) until she observed it. But after cornering him, she somehow instantly teleported back from Battler's room to the guesthouse corridor where she observed the tape seals (at the exact time of the logic error and without opening the door and breaking the seal herself!) - without giving Battler the ability to change his script so that someone broke the seal and rescued him from his room, which would have solved the logic error. She shouldn't have been able to observe the status of the seals until she exited Battler's room and walked there.
-- The logic error is easily solved by the fact that Dlanor didn't confirm that the window seal in the guesthouse was intact and I can't honestly buy that Battler missed that. He would have resigned for the first twilight but at least he wouldn't have had a logic error (he still had 7 murders left). Everything afterwards with using Kanon was just to make Erika lose her human culprit argument, but the logic error itself was easily solvable way before then.
Essentially, the scene arbitrarily decides when Battler can or can't revise his script, and when Erika can or can't check the status of seals she can't observe. If we take it at face value, it's inconsistent and a plot hole, but the reader (Ange) didn't care and no one (Beato/the witches) pointed it out. It's obvious why the story did this - if Battler had all of these options to escape the logic error and chose not to, then we would have suspected Battler of deliberately acting stupid (for his master plan of reviving Beatrice), and ruined the reveal at the end, so the story just... lied and said he didn't, in a way that created inconsistency. The result is that the entire skirmish feels cheap. Just wanted to vent because I was really excited when the scene started and it didn't deliver. It's a shame because the mystery itself was really fun, just the narrative around it was a huge bummer.
The rest of the episode was good at least. Around when the love trial claimed that one of the couples needs to kill the other, I started suspecting that maybe Kanon and Shanon both possess the same body or something (did the true perspective ever show their bodies separately? hmm)... I'm still not sure if that's correct because it wasn't outright revealed, but with the final scene confirming 17 people on the island, maybe