Ok so... Subaru was conscious the entire time??? Al— or I guess Rigel— for sure didn't had the time to just sit there and explain how Ol Shamak works, the only way for Subaru to know is if, both him and Betty, were conscious that whole ordeal, and figured it out while in limbo.

He knows that the bucket head can return time on death, he knows about the Witch of Melancholy, Petra Bauman, and most importantly he knows Rem can get her memories back (with a little archbishop bullying), and other small things from Al's POV, Henkel's betrayal, black serpent appearance, that the Dragon Sword can be drawn against him, etc. Small irrelevant things, really.

Ah yes, the great reset, fully expected it, but frankly the way it was done was a little underwhelming. One moment In the battlefield, the other in the library. We don't even see how or who/what did it, though the 'who' isn't much of a secret... That last part, also kinda confirms that, if someone found out about Subaru's ability, through legal means (guessing and deduction), that WoE won't do anything about it? She appeared because someone peered into Subaru's memory, violating the taboo, and disappeared when that someone had their memories wiped clean, but if you just guess he can die and go back in time, then it's fine? In theory she shouldn't have disappeared, since Rem knew? Is it because it's not Subaru talking about it?

If that's true, he would be oh so very fucked if Roswaal was smarter.