if(player != null)//если игрок "умерает" через Destroy
{
delta = player.position - transform.position;
delta.Normalize();
}

if(player != null)//если игрок "умерает" через Destroy
{
delta = player.position - transform.position;
delta.Normalize();
}
else
{
delta = transform.position;
}

public Transform player;//главн.герой
float offsetX = 10;//сам проставишь
float offsetZ = 10;//сам проставишь
float speed = 10;

void Update()
{
Vector3 nextPos = new Vector3(player.position.x+offsetX, transform.position.y, player.position.z + offsetZ);
transform.position = Vector3.MoveTowards(transform.position, nextPos, speed*Time.deltatime);
transform.LookAt(player);
}

void Update()
{
Vector3 delta = player.position - transform.position;
delta.Normalize();
float moveSpeed = speed * Time.deltaTime;
transform.position = transform.position + (delta * moveSpeed);
}

Vector3 deltaж
void Update()
{
if(player != null)//если игрок "умерает" через Destroy
{
delta = player.position - transform.position;
delta.Normalize();
}
float moveSpeed = speed * Time.deltaTime;
transform.position = transform.position + (delta * moveSpeed);
}

if (currentNumberOfEnemies > 0)

if (_hero.hp<=0)
yield break;// выход из корутины или просто break - выход из цикла, а корутина и так закончится...

if (currentNumberOfEnemies > 0) continue;

if (currentNumberOfEnemies > 0)
{
yield return null;
continue;
}

public class BlockItem:MonoBehaviour
{
float size = 10f;
float speed = .1f;
Vector2Int gridposition = new Vector2Int;
public void SetPosition(int x, int y)
{
gridposition.x = x;
gridposition.y = y;
if(transform.position.y!= (float)gridposition.y*size)
{
StartCoroutine(Move());
}
}

private IEnumerator Move()
{
Vector3 newpos = transform.position;
int dir = (transform.position.y> ((float)gridposition.y*size))?1:-1;
while(Mathf.Abs(transform.position.y - ((float)gridposition.y*size)>.1f)
{

newpos.y += + speed *dir;
transform.position = newpos;
yield return null;
}
newpos.y = (float)gridposition.y*size);
transform.position = newpos;
}
}