Reliable way to check for the player you're looking at

[Potatosayno]

Hello!
I'm trying to find a Reliable way to check for the player you're looking at, this is why:

= I have 2 Lua files =
• Lua file 1
• Lua file 2

Lua file 1 checks if you're looking at the player on primary attack and then Lua file 1 sends a command:
local tr = self.Owner:GetEyeTrace().Entity
if not tr:IsValid() then return end

self.Owner:ConCommand( CommandHere )

Lua file 2 then runs the command with a function and a check for the victim:
concommand.Add( CommandHere, function( ply, cmd, args )

local plyVictim = plyAttacker:GetEyeTrace().Entity
if plyVictim == nil or !plyVictim:IsValid() then return end

The problem is:
Lua File 1 finds the "tr/Victim" as TRUE while Lua file 2 sometimes finds "tr/Victim" as FALSE.

Is there a more reliable way to check in Lua file 2 for the Victim?
Thanks.

[Spar]

See the example here: Vector/Dot

[Potatosayno]

How would I find the entity the player is looking at from the direction he's looking at?
What if there are 2 players that are at the same direction away from you?

[Potatosayno]

Nevermind! I found a fix!
All I had to do was use a global variable in lua file one, include it in lua file 2 and use the global variable, it was connected to the victim.
Thanks for your help anyway, I'll give you the points for at least trying to help!