[exemplo] evandro desafio;

new timerdesafio_inicio[MAX_PLAYERS];
new timerdesafio_tempo[MAX_PLAYERS];

command(desafio, playerid, params []) {
    if(sscanf(params, "i", playerold)) return SendClientMessage(playerid, -1, "erro, use /desafio [playerid]");
    SetPlayerPos(playerid, x, y, z);
    SetPlayerPos(playeridold, x, y, z);
    TogglePlayerControllable(playerid, false);
    TogglePlayerControllable(playeridold, false);

    timerdesafio_inicio[playerid] = SetTimerEx("TimerDesafio_Inicio", 1000, true, "ii", playerid, playerold);
    return true;
}

forward TimerDesafio_Inicio(playerid, playerold);
public TimerDesafio_Inicio(playerid, playerold) {
    timerdesafio_tempo[playerid]++;
    GameTextForPlayer(playerid, timerdesafio_tempo[playerid], 998, 1);
    if(timerdesafio_tempo[playerid] == 5) {
        GameTextForPlayer(playerid, "GO GO GO", 998, 1);
        TogglePlayerControllable(playerid, true);
        TogglePlayerControllable(playeridold, true);
        return true;
    }
    else GameTextForPlayer(playerid, timerdesafio_tempo[playerid], 998, 1);
    return true;
}