Blitz hook bug

I think the same operation as something like ezreal timing his blink with the hook is happening. I imagine skills happening in order of execution. When the hook hits, there's a frame where you can execute another ability before the pull actually happens. It's in that moment where an ability proc'd during this frame of 'grab' and 'return' where certain abilities can override the 'return' part of the ability. Kind of like using an instant Cancel in MTG or something, since both abilities manipulate your position, there will be some abilities that will override.