def do(actor, targets)
    #Acceleration will be limited by elapsed time.
    push_force = delta
    targets.each do |target|
      #Angle to target is also angle of push force.
      push_angle = Utility.find_angle(actor.location, target.location)
      #Apply the force to the creature's movement vector.
      target.vector += Vector.new(push_force, push_angle)
    end
  end
def do(actor, targets)
    #Acceleration will be limited by elapsed time.
    push_force = delta
    targets.each do |target|
      #Angle to target is also angle of push force.
      push_angle = Utility.find_angle(actor.location, target.location)
      #Apply the force to the creature's movement vector.
      target.vector += Vector.new(push_force, push_angle)
    end
  end
Push the targets away from the actor, with force limited by elapsed time.