yes agree with Sundiata. slings should be on more lose formation while throwing rocks. there should be more space.
but at speed of running they should be faster than archers because they are lighter. they should cost less because they can collect their weapon from anywhere. as they are in lose formation, they also should take less damage and as they getting weapon from anywhere they must be able to throw in higher rate than archers, and archers should fire less if there is a less stock of arrows but they can collect arrow thrown from enemy if enemy have archers.
making anyone unable to fight I mean injure enemy is enough to get an upperhand in the real battle. so killing enemy is not necessary. lul.
I am agree with you. thanks.