How do I make this Anit-TK?

local Ray = Ray.new(Character.BodyHead.CFrame.p, (Mouse.Hit.p - Character.BodyHead.CFrame.p).unit * 999)
local Ignore = {Player.Character, Camera}
local PartHit, PositionHit = Workspace:FindPartOnRayWithIgnoreList(Ray, Ignore)
if PartHit and PartHit.Parent:FindFirstChild("Humanoid") then
    if not game.Players:GetPlayerFromCharacter(PartHit.Parent).TeamColor == player.TeamColor then
     PartHit.Parent.Humanoid:TakeDamage(math.random(mindamage, maxdamage))
    end
end;
if PartHit and PartHit.Name=="Main" then
    PartHit.Parent.Parent.Humanoid:TakeDamage(math.random(mindamage, maxdamage))
end;
if PartHit and PartHit.Name=="Part" then
    PartHit.Parent.Parent.Humanoid:TakeDamage(math.random(mindamage, maxdamage))
end;

Part changed :

if not game.Players:GetPlayerFromCharacter(PartHit.Parent).TeamColor == player.TeamColor then
     PartHit.Parent.Humanoid:TakeDamage(math.random(mindamage, maxdamage))
end

Uses the :GetPlayerFromCharacter method to find the player from the part, then compares the teamcolor of the player to the person firing (assuming the person firing is saved in a variable named player). The not at the beginning of the if statement indicates that the statement will return true if the opposite happens so the statement is equivalent to game.Players:GetPlayerFromCharacter(PartHit.Parent).TeamColor ~= player.TeamColor

Lastly, use Part.Parent:FindFirstChild("Humanoid") instead of Part.Parent.Humanoid because it can error