public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid)
{
    if(issuerid != INVALID_PLAYER_ID || playerid != INVALID_PLAYER_ID)
    {
        // anti-team-attack
        if(gTeam[issuerid] == TEAM_USA && gTeam[playerid] == TEAM_USA && EDM[playerid] == 0)
        {
            GameTextForPlayer(issuerid,"~r~do not team attack!", 3000, 3);
        }
        if(gTeam[issuerid] == TEAM_EURASIA && gTeam[playerid] == TEAM_EURASIA && EDM[playerid] == 0)
        {
            GameTextForPlayer(issuerid,"~r~do not team attack!", 3000, 3);
        }
        if(gTeam[issuerid] == TEAM_ARAB && gTeam[playerid] == TEAM_ARAB && EDM[playerid] == 0)
        {
            GameTextForPlayer(issuerid,"~r~do not team attack!", 3000, 3);
        }
        if(gTeam[issuerid] == TEAM_SOVIET && gTeam[playerid] == TEAM_SOVIET && EDM[playerid] == 0)
        {
            GameTextForPlayer(issuerid,"~r~do not team attack!", 3000, 3);
        }
        if(gTeam[issuerid] == TEAM_AUS && gTeam[playerid] == TEAM_AUS && EDM[playerid] == 0)
        {
            GameTextForPlayer(issuerid,"~r~do not team attack!", 3000, 3);
        }
        // anti team knifing
        if(gTeam[issuerid] == TEAM_USA && gTeam[playerid] == TEAM_USA && weaponid == 4)
        {
            GameTextForPlayer(issuerid,"~g~do not knife~n~team mates", 3000, 3);
            GameTextForPlayer(playerid,"~g~you got team knifed~n~use /sync", 3000, 3);
            SetPlayerHealth(issuerid, 0);
        }
        if(gTeam[issuerid] == TEAM_EURASIA && gTeam[playerid] == TEAM_EURASIA && weaponid == 4)
        {
            GameTextForPlayer(issuerid,"~g~do not knife~n~team mates", 3000, 3);
            GameTextForPlayer(playerid,"~g~you got team knifed~n~use /sync", 3000, 3);
            SetPlayerHealth(issuerid, 0);
        }
        if(gTeam[issuerid] == TEAM_ARAB && gTeam[playerid] == TEAM_ARAB && weaponid == 4)
        {
            GameTextForPlayer(issuerid,"~g~do not knife~n~team mates", 3000, 3);
            GameTextForPlayer(playerid,"~g~you got team knifed~n~use /sync", 3000, 3);
            SetPlayerHealth(issuerid, 0);
        }
        if(gTeam[issuerid] == TEAM_SOVIET && gTeam[playerid] == TEAM_SOVIET && weaponid == 4)
        {
            GameTextForPlayer(issuerid,"~g~do not knife~n~team mates", 3000, 3);
            GameTextForPlayer(playerid,"~g~you got team knifed~n~use /sync", 3000, 3);
            SetPlayerHealth(issuerid, 0);
        }
        if(gTeam[issuerid] == TEAM_AUS && gTeam[playerid] == TEAM_AUS && weaponid == 4)
        {
            GameTextForPlayer(issuerid,"~g~do not knife~n~team mates", 3000, 3);
            GameTextForPlayer(playerid,"~g~you got team knifed~n~use /sync", 3000, 3);
            SetPlayerHealth(issuerid, 0);
        }
        new str[26];
        format(str, sizeof(str),"-%.0f", amount);
        SetPlayerChatBubble(playerid, str, 0xFF0000FF, 100.0, 2000);
        PlayerPlaySound(issuerid,17802,0.0,0.0,0.0);
        // admin anti-slap
        new Float, Float:y, Float:z;
        new Float:gX, Float:gY, Float:gZ;
        GetPlayerPos(issuerid, gX, gY, gZ);
        if(PlayerInfo[issuerid][OnDuty] == 0 && PlayerInfo[playerid][OnDuty] == 1 && IsPlayerInRangeOfPoint(playerid, 35.5, gX, gY, gZ) && GetPlayerState(issuerid) == PLAYER_STATE_ONFOOT)
        {
            SetPlayerHealth(playerid, 100000000.0);
            GameTextForPlayer(issuerid,"~p~warning!~n~~w~do not attack~n~~w~on duty admins~n~~p~stop that!", 3000, 3);
            GetPlayerPos(issuerid,x,y,z); SetPlayerPos(issuerid,x,y,z+13);
        }
        if(PlayerInfo[playerid][OnDuty] == 1)
        {
            SetPlayerHealth(playerid, 100000000.0);
        }
    }
    return 1;
}