public OnPluginStart() HookUserMessage(GetUserMessageId("TextMsg"), Hook_TextMsg, true);
public Action:Hook_TextMsg(UserMsg:msg_id, Handle:bf, const players[], playersNum, bool:reliable, bool:init)
{
decl String:message[256];
BfReadString(bf, message, sizeof(message));
if (StrContains(message, "teammate_attack") != -1) return Plugin_Handled;
return Plugin_Continue;
}