Many things happened throughout the night, and it was a bountiful event.
Rex has finds that Adhara and Evelyn have started to use their logic more in approaching a problem, which is much needed for the two of them. It started when he got back from fighting the Executor, the two started to change for the better for some reason.
Additionally, he also gained crucial intel from Prof. K and Giana.
Not only he was now updated with the situation inside the human territory, but he also gained exclusive intel about King John's change and also the Executor's weakness which turns out to be cursed energy.
Cursed energy has never been a problem for Rex.
It was all thanks to the Eternal Curse inside of him, a high-epiphany natural curse that allows him to bypass most cursed powers. The Executor is probably not lucky enough to have this, thus he was injured by the Witch.
Other than that, his mind then wanders to the last folder inside the memory drive.