new bool:assasin[MAXPLAYERS + 1];
public OnPluginStart()
{
    HookEvent("player_hurt", Command_OUT, EventHookMode_Post)
}

public Command_OUT(Event event, const String:name[], bool:dontBroadcast)
{
    new client1 = GetEventInt(event, "attacker");
    if (Assasin[client1])
    {
         Assasin[client1] = false;
         PrintToChat(client1, "Вы снова видимы!");
         SetEntityRenderColor(client1, 255, 255, 255, 255);
         GivePlayerItem(client1, "weapon_knife");
    }
    return Plugin_Continue;
}