This will show the predator that you are not an easy meal, and it will likely back away. However, the best course of action is to always carry bear spray with you if you’re hiking in an area that is known to have predatory bears in it.
Dying Canaries
A surprisingly accurate way to determine if an area is safe to be in is whether a canary can enter and exit without either passing out or dying. This is pretty unethical, but this was how miners were able to determine whether there were natural gas deposits in places where they were excavating.