[ZeroTheScyther]

Try [ pawn ] on the code ... anyway the code you just made it's a bit wrong ... what you mad should be like "When a player presses right click, his health gets lowered." You want to make a zombie bite system so it should work like this...

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys) //enter shop
{
    if(newkeys == KEY_AIM)
    {
        if(gTeam[playerid] == TEAM_ZOMBIES)
        {
            if(GetDistanceBetweenPlayers(playerid,playerid2) < 3)
            {
                if(gTeam[playerid2] !=TEAM_ZOMBIES)
                {
                GetPlayerHealth(playerid2, Health);
                SetPlayerHealth(playerid2, Health-10);
                }
            }
        }
    }
    return 1
}


stock GetDistanceBetweenPlayers(playerid,playerid2)
{
    new Float:x1,Float:y1,Float:z1,Float:x2,Float:y2,Float:z2;
    new Float:tmpdis;
    GetPlayerPos(playerid,x1,y1,z1);
    GetPlayerPos(playerid2,x2,y2,z2);
    tmpdis = floatsqroot(floatpower(floatabs(floatsub(x2,x1)),2)+floatpower(floatabs(floatsub(y2,y1)),2)+floatpower(floatabs(floatsub(z2,z1)),2));
    return floatround(tmpdis);
}

I think it's wrong but it's worth trying.