Oh my, now that's some action. These past few chapters I've got my tiny crumbs of worldbuilding as well, so I'm pretty happy. Like, it's a sweet little detail that gender-restricted zones take the ABO gender into account that much more than your usual male/female.
Also, I suppose your perception of pheromones might change based on the fact that you really dislike the person? Or are there some other conditions and requirements, like being marked, or imprinted, beforehand?