The establishing of rules coming before all the action really should be easy to learn about when you do a little research. It's the most important rule of BDSM after all. This implementation is just lazy and poorly done. The writer did know about safe words after all, because the conversation is there. But they just went with the awkward "ride the Bull" nonsense first and then added the "I know what you need" mind-reading to the rules dialogue. Bleh.
Just to offer a different perspective on this, a lot of the Asian BDSM community don't use safe words at all. They tend to feel that the Top should always be cognizant of the Bottom's state of mind, and to know when "Stop" means "Stop" and when it means "I could use a little more". I'm not Asian myself, but I've been with some Asian women, again on both ends of the relationship To be completely honest, I've done some fairly hardcore stuff and I prefer not having one. I only do it with women I trust, and it adds a sense of uncertainty to things.
Having said all of that, even if you think a safeword is vital, I still don't have any issue with the conversation coming after the act, simply because you have no idea what the actual act is. It's entirely possible it consisted of Bull lightly binding the Inquisitor's hands in front of her, in a way that is easily escapable and more symbolic than anything, and said, "Tell me when you want me to stop". Then, after, when it was decided that things should progress, he wanted to make sure to have the "rules" conversation because he knew things would slowly get more intense.
As for anyone who was disappointed in their two romance options, I'm right there with you. All I've ever wanted is something between Bull and Jack for a F/F romance, but all I ever end up getting is romance. Isabella is my favorite F/F romance, but it's still not really that close to what I'm asking for.