a = @battler.current_action 
if a.kind == 1 && a.skill_id == 57
 @targets.each do |t|
  if t.damage.is_a?(Numeric) && rand < 0.25
   t.hp = [t.hp-t.damage,0].max
   t.damage = t.damage * 2   
   t.critical = true
  end
 end
end