public IEnumerator Attack(Attackable target)
{
// if already attacking or enemy out of range do not allow to attack
if (!_canAtk || TileObject.MaxDistance(this.tileObj, target.tileObj) > range)
{
yield break;
}
OnAttackBegin();
target.ApplyDamage(damage);
yield return(new WaitForSeconds(attackRate));
OnAttackEnd();
}