It's a busy park in the touristy areas. This was in the backcountry. It's been a tough year for bears, it hasn't been a very good year for the berries they so heavily rely on, and they are having to resort to mainly carnivorous meal sources. This is the time of year they are just eating like mad too, before they go into their dens, so bear encounters this time of year can go pretty sideways. Especially if it was a close surprise. I doubt we'll ever know what happened here. It's a tragedy, for all involved.