Would a grizzly bear eat a mountain lion?
Probably not, unless the mountain lion was dead or incapable of fighting back. Grizzlies assess situations in terms of the threats to their well being. If a grizzly could be hurt in an attempt for food and would therefore be unable to eat, it will probably just go find something else to devour. Therefore, it is highly unlikely that a grizzly would eat a mountain lion, because a mountain lion could do some serious damage to a grizzly.