You would hit the target you had soft-locked, provided you were aiming at them. Another target could not step in the way of the soft-locked target to prevent you from hitting your soft-locked target.
I say again, some kind of reality bending arrow matrix stuff? Seems legit!
The players skill with aiming a bow is second to none. Simply point 'that-a-way' and regardless if 1 or 100 people are in front of them, you will hit them.
Surely we should need to become good at aiming and arrow trajectory in order to land a lethal hit on your target, but I guess im just old fashioned....