Duskblade Vision Interaction with Twitch Ambush

When Twitch is seen by Duskblade during his ambush their should be more notice for the Twitch. There is only a subtle red static around you like there is on wards when they are under a sweeper or control ward. I'm aware that Duskblade range is larger than Twitch ambush range but can we at least make it so the vision icon turns red when they see you? Currently it still stays yellow and you are deceived thinking they can't see you still. Not a huge problem but I have noticed it twice now while playing Twitch against a Duskblade user and tested in a custom.