Ok, moving forward it will be wise to only QT one at a time. I'm not sure if you saw tttaylorrr's thread discussing her two animals passing? But it started by quarantining two animals in the same room. Just not worth the risk to the animals. Unfortunately Taylor learned the hard way, but since she was cool enough to be willing to share her story the rest of us can learn from it.
Also, just throwing it out there, but snakes and other pets don't mix. It would be in your snakes best interest to keep the cat away. My cats aren't allowed in my snake room and when snakes are out cats are locked in other rooms. It's simply not fair to the snakes.