public void FollowLeader(MoveController leaderController, float minDistBehind)
{
Vector3 leaderDirection = leaderController.GetCurrentVelocity ().normalized;
Vector3 leaderPos = leaderController.transform.position;
Vector3 desiredPos = leaderPos - leaderDirection * minDistBehind;
finalSteering += _Seek (desiredPos);
}