This is really just due to yet another bad wording choice in a Heroclix rulebook. Charge & RunShot say 'reduce' speed value by half, effectively causing the division and rounding (up) of odd speed value numbers.

The multiple-target ranged attack text should never have said 'divide' though, as that causes confusion with the above rounding rules. Since we're not required to 'divide' dmg evenly among targets(a 3dmg, 3target attacker can go 1,1,1; but it can also go 2,1,0 or 3,0,0), and can only assign full dmg points & not fractions, the word WK should have used was 'distribute', not divide.