Use of force incidents are fluid & stressful but its important to know what you'd do in a given situation.
About 5 years ago, a female uniformed deputy in my area was seriously injured by a unarmed larger male. The sworn deputy chased the subject out of a Home Depot when he turned & lunged at her in the parking lot.
If I were a bystander or witnessed the attack, I would draw and fire on the male subject if I had a clear shot. The subject beat & choked the deputy savagely. She was seriously injured & was in a ICU for several days. The male who beat her was later convicted of multiple charges. The female deputy got a medical retirement.
If a armed person is attacked, it clearly demonstrates the level of instability & violence a subject is capable of which causes an increased risk to public safety.