You might be right but I doubt the law is written so as to prohibit carrying a rifle in the field during bow season. Back when I used to bow hunt in Idaho, you couldn’t carry a rifle while bow hunting but there was nothing to prevent you from carrying a rifle while packing out game during bow season or for any other reason as long as you weren’t bow hunting. I also wouldn’t be surprised that a licensed guide would have a different set of rules than a bow hunter.
Oregon had to fight just to make it legal to carry a sidearm during bow season. Or, rather, to convince O. Fish snd Wildlife that only the legislature could make rules about carrying firearms. Pre-emption. Gotta read the regs. I’m guessing that the odds of running into a grizzly were kinda remote. A 10mm seems like minimum effort, and no excuse for not having it in a holster. Live and learn...if you live.