i want to make use [halo.add] only murderer can see through the wall

it’s so hard to me
i’m so stupid plz teach me

function GM:PlayerPickupLoot(ply, ent)
if ply:GetMurderer() then
if ply.LootCollected == 5 then
[use halo.add here]

What do u want to do exactly?

exactly i want to make only murder can see other players through the wall

See what???
The player??? The loot???

the player

Alright so first, this is to be done clientside.
When the round starts(hook) build a table of players (local ply table = players.GetAll()) and draw a halo of the table outside of the hook.

thank you