@Siikalahna If you look carefully, the wall suddenly goes black and White. Then in the next panel, the colors return. You can see the wooden wall beams getting red again.
Honestly, it was a beautiful and awesome timeskip.
If only the author had painted the walls of a different color instead of white, it would have been more noticable.
I feel like the artist/author tried to do something with the time skip, like the movies usually do, but failed. It was confusing mostly. If it had been less confusing, it'd be better.