gmod halo help

function track(att, path, dmginfo)
   local ent = path.Entity
   local plytotal = {}

   if not IsValid(ent) then return end
   if not ent:IsPlayer()  then return end

   plytotal[1] = ent

   timer.Simple(3, function()
      hook.Add( "PreDrawHalos", "AddTrackHaloeth", function()
         halo.Add( plytotal, Color( 255, 0, 0, 255 ), 1, 1, 2, true, true )
      end )
   end)
end