John Buhmiller had a dead buff knock him over and head land in his lap. His legs and hips were bruised for months.
Kill a grizzly mid-stride and good chance he will bowl you over. Spray him with pepper spray and he'll stop mid-stride from the same distance - maybe - if the spray is correctly placed and he's sensitive to it.

Can't help but think of my daughter's tree planting crew getting back to camp & finding a large black bear on the park picnic table eating a can of bear spray. His face was red from the capsicum pepper spray coming out the canine holes he put in the can - & there he was, lapping it up.