Ranged AI Script: Move short distance in direction of prev. defeated enemy if no new target

Is this kind of thing possible with scripting? I dunno anything at all about scripting. It's really annoying that even with a Ranged script my ranged characters will help kill melee attackers but won't move forward to help deal with ranged attackers (My melee characters will though, since their usually the ones being attacked by the ranged enemy attackers).

Ranged AI Script, modify it so that they move a short distance in the direction of the previously defeated enemy if no new enemy is in their range.