[xines]

I'm not sure if this is what you're trying to do, but i recoded it fast so give it a try.

PHP Code:

#pragma semicolon 1
#include <sourcemod>

#undef REQUIRE_PLUGIN

#define PLUGIN_VERSION            "1.4"
#define PLUGIN_DESCRIPTION        "Friendly a player if he does [n] amount of kills in [n] seconds"

new bool:timer_friendly[MAXPLAYERS+1];
new kCount[MAXPLAYERS+1];
new kFirstKill[MAXPLAYERS+1];

new    Handle:kvar_Kills = INVALID_HANDLE,
    Handle:kvar_Time = INVALID_HANDLE,
    Handle:kvar_ftime = INVALID_HANDLE;

public Plugin:myinfo =
{
    name        =    "kBans",
    author        =    "Dreamy",
    description    =    PLUGIN_DESCRIPTION,
    version        =    PLUGIN_VERSION,
    url            =    "http://SourceMod.net"
};

public OnPluginStart()
{
    CreateConVar("kBans_version", PLUGIN_VERSION, "kBans Version", FCVAR_PLUGIN|FCVAR_SPONLY|FCVAR_REPLICATED|FCVAR_NOTIFY|FCVAR_DONTRECORD);
    kvar_Kills = CreateConVar("kBans_kills", "2", "Amount of kills players are not allowed to do in [n] seconds", FCVAR_PLUGIN, true, 1.0);
    kvar_Time = CreateConVar("kBans_interval", "10", "In which interval players are not allowed to do [n] kills", FCVAR_PLUGIN, true, 0.0);
    kvar_ftime = CreateConVar("kBans_friendlytime", "5.0", "0 = Permban, >0 = Time in minutes", FCVAR_PLUGIN, true, 0.0);
    AutoExecConfig();
    
    HookEvent("player_death", Event_PlayerDeath);
}

public Event_PlayerDeath(Handle:event, const String:name[], bool:dontBroadcast)
{
    new victim = GetClientOfUserId(GetEventInt(event, "userid"));    
    new client = GetClientOfUserId(GetEventInt(event, "attacker"));
    decl String:weapon[16];
    GetEventString(event, "weapon", weapon, sizeof(weapon));
    if (!client || (client == victim) || StrEqual(weapon, "hegrenade"))
    {
        return;
    }

    new time = GetTime();

    if ((kFirstKill[client]+GetConVarInt(kvar_Time)) >= time)
    {
        if (kCount[client] == GetConVarInt(kvar_Kills))
        {
            decl String:auth[32];
            GetClientAuthId(client, AuthId_Engine, auth, sizeof(auth));
            if (timer_friendly[client] == false)
            {
                LogMessage("The player %N (%s) got friendly activated.", client, auth);
                PrintToChat(client, "\x04[friendly] \x01Activated On %N", client);
                new userid = GetEventInt(event, "attacker");
                ServerCommand("sm_friendly %d 1", userid);
                timer_friendly[client] = true;
                new Float:ftime = GetConVarFloat(kvar_ftime);
                CreateTimer(ftime, Friendlytimer, client);
            }
        }
    }
    else
    {
        if (timer_friendly[client] == false)
        {
            kCount[client] += 1;
            kFirstKill[client] = time;
        }
    }
}

public Action:Friendlytimer(Handle:timer, any:client)
{
    PrintToChat(client, "\x04[friendly] \x01Stopped");
    for(new userid = 1; userid <= MaxClients; userid++)
    {
        ServerCommand("sm_friendly %d 0", userid);
    }
    timer_friendly[client] = false;
    kCount[client] = 0;
    kFirstKill[client] = 0;
}

public OnClientPutInServer(client)
{
    kCount[client] = 0;
    kFirstKill[client] = 0;
    timer_friendly[client] = false;
}

public OnClientDisconnect(client)
{
    kCount[client] = 0;
    kFirstKill[client] = 0;
    timer_friendly[client] = false;
}