My SCP look detection is broken?

I have made a simple look detection for my 096 scripts, but if I look backward or forward towards him, he activates. But if I look to the side he doesn't.

I was to look directly at him towards the front of the player.

function checksee()
	while heartbeat:wait() do
		for i,v in pairs(workspace:GetChildren()) do
			if v.ClassName == "Model" and v ~= script.Parent then
				print("working")
				local characterhumanoid = v:findFirstChildOfClass("Humanoid")
				local characterLdet = v:findFirstChild("Head")
				local characterhead = script.Parent:findFirstChild("Head")
				if characterhumanoid and characterLdet then
					if characterhumanoid.Health > 0 then
						if (characterLdet.Position - script.Parent.Head.Position).magnitude < 75 then
							if characterLdet.Orientation.y > characterhead.Orientation.y then
								if angered == false then
									angered = true
									script.Parent.Head.face.Texture = "http://www.roblox.com/asset/?id=2651222659"
									print("I got stared at by "..v.Name)
									script.Parent.Humanoid.WalkSpeed = 0
									script.Parent.Head.Docile:Stop()
									script.Parent.Head.DocileToRage:Play()
									script.Parent.Head.DocileToRage.Ended:Wait()
									script.Parent.Head.Rage:Play()
									script.Parent.Humanoid.WalkSpeed = 21
									kill = true
									wait(15)
									script.Parent.Head.face.Texture = "http://www.roblox.com/asset/?id=861024822"
									kill = false
									script.Parent.Head.Rage:Stop()
									script.Parent.Head.RageToDocile:Play()
									script.Parent.Head.RageToDocile.Ended:Wait()
									script.Parent.Head.Docile:Play()
									angered = false
									wait(7)
								end
							end
						end
					end
				end
			end
		end
	end
end