I can see that for the first session. I've done that with video slaves to see how much they can be pushed on camera. For the color coded safety words all of the time, I've always found it odd. A client came to see me once and, wanted to play that way. It had the feel of giving someone a massage with a cane. A little higher, a little lower, ect. I'm all for to each their own...but, I wouldn't have wanted to play that way on an on going basis. Glad this worked out for you. It seems like a great way to evaluate a new play partner.