I'm not really sure what you're getting at with "prolonging the situation." The snake can smell the rottweiler, it doesn't need to see or interact with it to get used to the scents, and putting them together would probably just escalate the situation.
The bite you described sounds like a feeding response, they usually only wrap when they think something is food, and bite and let go if it's defense. I would also say the fact it had been in your room all night going about it's business and then you all of a sudden started moving probably instigated the bite. It's in an unfamiliar place (at least it's not usually there for a prolonged period of time), so it could be on edge. There is no reason to have a snake out more than an hour in a regular handling session if you can help it, let alone in your room all day. Chances are, if you're comfortable enough to sleep in your room, unless you like your room hot, it's not the right temp for your Boelen's. I know they like cooler temps but it seems to me most people are comfortable at 70F or below, which I'm fairly certain is too low even for a Boelen's. If your room is in the low 80's and you're comfortable with that that's another story, but the humidity is probably also rather low.
You'd also be surprised where an 8' python can go, I wouldn't really chance an escape or injury by allowing it to free roam, even for a night. Their enclosures should be designed to have their preferred conditions, and that is where they should spend the majority of their time for their health. I read a story a few months back where a ball python owner thought they were providing high temps and humidity for their snake, and allowed it to free roam the house. It ended up dying from exposure, was severely dehydrated and slightly underweight, with an RI and possibly other conditions. Don't free roam your pets.
