Here is an article about fatal attacks where bear spray was used. Of the nine people killed, 7 were predatory attacks. Of the seven, 4 were grizzly/brown bears for certain, one was probably a grizzly (not certain), and 2 were black bears.
Biased to an extent because many more people carry bear spray for protection against grizzly/brown bears than against black bears.
“There are a fair number of predatory attacks by grizzly/brown bears which stalk their prey.”
I think you’re confusing territorial defense and opportunistic feeding with predatory behavior.