The episode ends at the Lifaus Highway near Flugel’s Tree. As Subaru’s phone alarm goes off, the massive White Whale appears from the sky, and Rem initiates the battle with a preemptive strike. Notable Production Details
Reviewers note that this episode marks the "end of Subaru's stupidity". For the first time, he isn't acting out of rash emotion; instead, he is "resource allocating," figuring out which political and military pieces he needs to move to overcome the seemingly impossible obstacle of the White Whale. Re:Zero kara Hajimeru Isekai Seikatsu Episode 19
They chose the track "Yoake no Michi" (Path of Dawn), which they felt best suited Subaru's character and the atmosphere of the scene. Character Shifts The episode ends at the Lifaus Highway near Flugel’s Tree