SandwormAI - Updating

public override void DoAIInterval()
{
    base.DoAIInterval();
    if (StartOfRound.Instance.livingPlayers == 0 || isEnemyDead)
    {
        return;
    }
    PlayerControllerB playerControllerB = null;
    switch (currentBehaviourStateIndex)
    {
    case 0:
        if (!emerged && !inEmergingState)
        {
            if (!roamMap.inProgress)
            {
                StartSearch(base.transform.position, roamMap);
            }
            agent.speed = 4f;
            playerControllerB = GetClosestPlayer(requireLineOfSight: false, cannotBeInShip: true, cannotBeNearShip: true);
            if (playerControllerB != null && mostOptimalDistance < 15f)
            {
                SetMovingTowardsTargetPlayer(playerControllerB);
                SwitchToBehaviourState(1);
                chaseTimer = 0f;
            }
        }
        break;
    case 1:
        if (roamMap.inProgress)
        {
            StopSearch(roamMap);
        }
        targetPlayer = GetClosestPlayer(requireLineOfSight: false, cannotBeInShip: true, cannotBeNearShip: true);
        if (mostOptimalDistance > 19f)
        {
            targetPlayer = null;
        }
        if (targetPlayer == null)
        {
            SwitchToBehaviourState(0);
            break;
        }
        SetMovingTowardsTargetPlayer(targetPlayer);
        if (chaseTimer < 1.5f && Vector3.Distance(base.transform.position, targetPlayer.transform.position) < 4f && !(Vector3.Distance(StartOfRound.Instance.shipInnerRoomBounds.ClosestPoint(base.transform.position), base.transform.position) < 9f) && UnityEngine.Random.Range(0, 100) < 17)
        {
            StartEmergeAnimation();
        }
        break;
    }
}

public override void Update()
{
    base.Update();
    if (isEnemyDead)
    {
        return;
    }
    if (stateLastFrame != currentBehaviourStateIndex)
    {
        stateLastFrame = currentBehaviourStateIndex;
        chaseTimer = 0f;
    }
    switch (currentBehaviourStateIndex)
    {
    case 0:
        if (creatureSFX.isPlaying)
        {
            creatureSFX.Stop();
        }
        break;
    case 1:
        if (!creatureSFX.isPlaying && !inEmergingState && !emerged)
        {
            int num = UnityEngine.Random.Range(0, ambientRumbleSFX.Length);
            creatureSFX.clip = ambientRumbleSFX[num];
            creatureSFX.Play();
        }
        if (!base.IsOwner)
        {
            break;
        }
        if (targetPlayer == null)
        {
            SwitchToBehaviourState(0);
            break;
        }
        if (!PlayerIsTargetable(targetPlayer, cannotBeInShip: true) || Vector3.Distance(targetPlayer.transform.position, base.transform.position) > 22f)
        {
            chaseTimer += Time.deltaTime;
        }
        else
        {
            chaseTimer = 0f;
        }
        if (chaseTimer > 6f)
        {
            SwitchToBehaviourState(0);
        }
        break;
    }
}