I want the enemy to take damage, only if im facing them (combat script)?

I didn't post the whole script, only the part im having trouble with.

Character is me (the player that is punching, passing with remote event, local -> server)
m is the other player.

I tried doing if Character is looking at the m they take damage, but now the enemy won't even take damage, even if i am facing or not, what am i Doing wrong?

	for i,m in pairs(game.Workspace:GetChildren()) do
		if m and m:FindFirstChild("Humanoid") and m ~= Character then
			if (Character.HumanoidRootPart.CFrame.LookVector - m.HumanoidRootPart.Position).Magnitude <= 8 then
				print("humanoid nearby")
				m.Humanoid.Health -= 10

Haven't tested this out fully, but try this:

local wc = workspace:GetChildren()
local wcn = #wc
for i = 1, wcn do
	if wc[i] and wc[i]:FindFirstChild("Humanoid") and wc[i] ~= Character then
		local difvec = (Character.HumanoidRootPart.Position - wc[i].HumanoidRootPart.Position).Unit
		local dot = difvec:Dot(wc[i].HumanoidRootPart.CFrame.LookVector.Unit)
		
		if dot > 0 then
			print("Humanoid nearby")
			wc[i].Humanoid.Health = wc[i].Humanoid.Health - 10
		end
	end
end

The idea of this is to take the dot product of the vector between the player and the other character, and the player's look direction. If I did this correctly, this should result in the enemy being hit if they are within 180 degree field of view of your character's view direction.