That would've been bloody scary with two such big and powerful dogs.
I had a dog whose hobby it was to get into scraps. I witnessed dozens and only once was there blood, and it was my dog who got puncture holes - and nothing requiring medical attention. But it still got the adrenaline going and even though I got used to it up to a point, there were still times when I got very emotional because I had not managed to prevent it. But there is very little you can do about a situation like you described. When the other dog is that close and ready 'to go', we get reminded that physically we are piss weak compared to our canine companions.
Adrenaline will do weird things to your brain though. Hope you are feeling better now and that your body is not feeling sore anymore. At least you know that Bernie is not inclined to try rip flesh of an opponent, which is a blessing.