A fix for https://www.youtube.com/watch?v=dw-xB0jHrt4

spectator_kill_fix.sp

#pragma semicolon 1
#pragma newdecls required

#include <sourcemod>
#include <sdktools>
#include <events>

#define PLUGIN_VERSION "0.7"

public Plugin myinfo = 
{
	name = "Spectator Kill Fix",
	author = "fakuivan",
	description = "Fixes an exploit related to projectiles and entities not being kill on team switch",
	version = PLUGIN_VERSION,
	url = "https://forums.alliedmods.net/member.php?u=264797"
};

public void OnPluginStart()
{
	//CreateConVar("sm__version", PLUGIN_VERSION, "Version of ", FCVAR_SPONLY|FCVAR_REPLICATED|FCVAR_NOTIFY);
	HookEvent("player_team", Event_OnClientChangeTeam, EventHookMode_Pre);
	RegAdminCmd("sm_trigger_distroy_me", Trigger, ADMFLAG_RCON);
}

char gs_prop_ents[][][] = 
{
	{"tf_projectile_energy_ball"	, "m_hOwnerEntity"},
	{"tf_projectile_rocket" 		, "m_hOwnerEntity"},
	{"tf_projectile_pipe" 			, "m_hThrower"},
	{"tf_projectile_pipe_remote" 	, "m_hThrower"},
	{"obj_sentrygun" 				, "m_hBuilder"},
	{"obj_dispenser" 				, "m_hBuilder"},
	{"obj_teleporter" 				, "m_hBuilder"}
};

public Action Trigger(int i_client, int i_args)
{
	CleanParented(i_client, gs_prop_ents, sizeof(gs_prop_ents));
}

public void Event_OnClientChangeTeam(Event h_event, const char[] s_name, bool b_dontBroadcast)
{
	char s_client_name[MAX_NAME_LENGTH];
	int i_userid = 		GetEventInt(h_event, "userid");
	int i_team = 		GetEventInt(h_event, "team");
	int i_old_team = 	GetEventInt(h_event, "oldteam");
	bool b_disconnect = GetEventBool(h_event, "disconnect");
	GetEventString(h_event, "name", s_client_name, sizeof(s_client_name));
	
	PrintToServer("[SPECTATOR HOTFIX] Player %N changed team", GetClientOfUserId(i_userid));
		
	if (b_disconnect || i_team == i_old_team)
	{
		return;
	}
	
	PrintToServer("[SPECTATOR HOTFIX] Killing player %N's things", GetClientOfUserId(i_userid));
	
	CleanParented(GetClientOfUserId(i_userid), gs_prop_ents, sizeof(gs_prop_ents));
}

void CleanParented(int i_client, char[][][] s_ent_prop_names, int i_entnum)
{
	int i_entity;
	for (int i = 0; i < i_entnum; i++)
	{
		while ((i_entity = FindEntityByClassname(i_entity, s_ent_prop_names[i][0])) != INVALID_ENT_REFERENCE)
		{
			int i_owner = GetEntPropEnt(i_entity, Prop_Send, s_ent_prop_names[i][1]);
			if (i_owner == i_client)
			{
				AcceptEntityInput(i_entity, "Kill");
			}
		}
	}
}