void ComputePush(){
        push = Vector3.zero; Vector3 pos = transform.position; float minSqr = minDistance * minDistance; float blockSqr = attackBlockDistance * attackBlockDistance; bool tooClose = false;
        foreach (var other in all){
            if (other == this || other.enemy.enemyIsDead) continue;
            Vector3 away = pos - other.transform.position; away.y = 0f; float sqr = away.sqrMagnitude;
            if (sqr < blockSqr) tooClose = true;
            if (sqr >= minSqr) continue;
            float dist = Mathf.Sqrt(sqr);
            away = dist < 0.01f ? Quaternion.Euler(0f, Random.value * 360f, 0f) * Vector3.forward : away / dist;
            push += away * (minDistance - dist) * pushSpeed;
        }
        if (!tooClose) { crowdedTime = 0f; crowded.Remove(enemy); return; }
        crowdedTime += checkInterval;
        if (crowdedTime < maxAttackDelay) crowded.Add(enemy); else crowded.Remove(enemy);
    }