I have no issue whatsoever with your actions and commend you on your survival.
I have enormous issues with the actions of the guide/pilot. If his plan for an aggressive brown was to grab the nearest client and leave the area immediately and hope the other guy figures it out, then he needs to think through a better emergency action plan. While I haven't fished for salmon in AK, I have done a lot of black bear hunting in BC where grizzly encounters are very common. It is beyond my comprehension he would allow his clients to separate like that without simple radios - I don't care if one of his clients stepped out of a James Fenimore Cooper novel. Following up a bear, recovering one, or even on a long stalk, we always have communications. An angry bear is just one of a dozen of things that can happen.
Let's say saving the plane was in his mind more important than looking after his other client. With a couple of $30 dollar Motorolas he could have at least warned the separated client and told him what was transpiring.
Glad he came back.