I'd still say the bear. Even with a knife, you probably won't do much against a bear with that much fat and muscle. Bears have been known to break the spine of bulls with a single maul. Now that's scary. Bears do the same, they bite the jugular first, or bite the shoulders of animals, disabling their prey. They have a pretty impressive bite strength. A 800 pound grizzly can produce approximately 1500 pounds of bite strength. I'd believe the tiger would have a similiar amount.

If we change the scenario and pit the tiger versus the bear, who would come out on top?