That's one animal I've never got a photo of. Never seem to have a camera with me when I bump into them. I used to go up to Alaska a lot. Mostly fishing, occasionally bear hunting while fishing. My only serious encounter was with a Grizzly in Alaska while fishing. He was seriously offended with our presence and if we had not thrown a few salmon at his feet in an offering, we may have had a serious incident.
I've encountered Grizzlies in Yellowstone in the back country around Mary Lake as we rode horses in. For the most part, those bears disappeared as soon as they discovered us.
I have much more experience with the buffalo. We see them so often that we become a little casual to their presence. I always try to keep a enough distance that if one becomes riled, I have enough space to get my horse up to speed to make up for the quick first those critters have. And we have had a few buffalo charge us. Luckily they don't pursue you very far. If you get out of their way quickly, they are happy to return to being lazy.
If you out number them, The bison will usually move away.
Sometimes in the winter months we just ride right upon them in the fog.