There are two kinds of bears that stalk their prey. Black bears and polar bears.
The rest of the bear community are opportunistic feeders and do not stalk their prey but... they will defend their territory.
I was up way up North Alaska working on antenna systems with a team of contractor’s back in the late 90s and we were out in the field, with protection services provided and one of the protection services personnel glassed a polar bear about a thousand yards out or so (don’t ask me how) and immediately advised us to get packed up and “let’s get back into the transportation.” I asked why and was told that a polar bear had “sniffed us” and we were now the subject of his dinner. They were concerned. We were too. We went back to that site a week later (a precautionary amount of time) to finish up the job before the weather changed. It was weird being part of the food chain and we were certainly not sourdoughs. Although we were most certainly Hyderized by the time we left the state.
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.