During the fight to stop the beast from performing his spell, the artifact he is using is split into three pieces. When he returns after being sent through a portal, he replaces it on the floor in one piece, without having had the time to put it back together.
When the sun is starting to black out, we can see a sunset like glow in the sky. This wouldn't happen unless the sun was actually setting or rising, and the sun is clearly high in the sky, and should be behaving more like during an eclipse.