.you passed V1 but you haven't yet reached VS and VMCA so how can you decide to go if you are below stall speed and min. controllability??
In very very simple terms:.
You are above V1 so by definition you are not able to stop anymore (for whatever reason) ...however
you should still be accelerating along the runway towards VR.
You are certainly committed to going aviating but you are not flying
yet, you're just driving a multi tonne tricycle along the runway at increasing speed..
At VR, and not before, you rotate, and it is only at that point your aircraft actually becomes a flying machine.....
Now have another think about when VS "applies" to an aircraft and also what the "A" in VMCA stands for... hopefully that should help you understand why V1 might be less than VS and VMCA, and why in turn they have to be less than VR.
Hope that Helps.