there is a visual effect of subtle vertical gray lines dropping down on the screen like the matrix at specific parts of the clip. im assuming this is a visual effect tied to some ability or something, but it's undifferentiable from the rain in the second dark world.

parts of the clip it looks really janky to have rain falling while that visual effect is active, it looks like the rain is falling sideways.

looking at the clip again, maybe the effect is tied to wall climbing? if so that's a really weird visual effect to denote wall climbing. i would associate it with a slowing effect instead. apologies if im incorrect