I live one mountain range over from you, and I imagine we have all of the same predators. My chickens love to free range, but they only get to be out when I'm out. And, yes, they are trained to come when I signal them.
This hasn't stopped bears from coming in to make a try for my chickens in spite of me being right there. The bear is so focused on the chickens, it isn't even aware of me. Once I even walked right up to the bear, hollering at it, and not being able to get its attention, I dropped a ten pound rock on its back. It finally took notice of me, and luckily decided to leave rather than eat me. Another bear a few years later charged me trying to get to my chickens. I was lucky I was fast enough to duck into the run and close the gate just as the bear reached the run. It proceeded to snarl and tried to get into the run as I screamed at it and pounded the fenced with my fists trying to scare it off.
Another time, a hawk dive-bombed my chickens who were right at my feet as I was peeling logs exposing bark beetles for them to eat. A few weeks ago, another hawk dove at my chickens who were romping just outside my bedroom slider. I was inches away.
A good friend who lived a few miles from me was out with her chickens when a bobcat zoomed in and snatched her hen who was right at her feet.
The only time I'm certain my chickens are safe is when they are enclosed in their covered run with the hot wire charged. When I'm in the run during bear season, I have finally learned to keep a can of pepper spray always handy.
Don't even bring up the topic of guns. There has never been an opportunity to run into the house and get the gun in any of my encounters with predators. But a can of pepper spray in five different locations assures I will have it handy should I need it. But the worst predator is hawks, and pepper spray isn't any good against them.