Yeah, I just re-watched it and realized how low my hand is. It isn't covering anything. This is more of the cards is slipped over than placed on. It's not very angle sensitive- only from the back and one side. I think I'll re-film it.
well, i was really bored so i went and created a one-handed window change. here it is and thought i'd share it with people. also i'd like to know what others think of it.