[CrazyFrenzy]

OnPlayerUpdate is not recommended. You may use a timer like this

PHP Code:

forward _UpdatePlayersStatus();


public OnGameModeInit()
{
    SetTimer("_UpdatePlayersStatus", 1000, true);
    return 1;
}

public _UpdatePlayersStatus()
{
    new Float:plHealth;
    for(new i = 0,j = GetMaxPlayers(); i < j; i ++)
    {
        if(!IsPlayerConnected(i)) continue;
        GetPlayerHealth(i, plHealth);
        if(plHealth <= 20)
        {
            ApplyAnimation(i, "CRACK", "crckdeth2", 4.0, 1, 0, 0, 0, 0);
        }
        else if(plHealth >= 30)
        {
            SetPlayerSpecialAction(i, SPECIAL_ACTION_NONE);
            ClearAnimations(i);
        }
    }
}