Yeah. You just keep allowing them to get closer, and closer, until they are too close to stop.
The police learned this in a classic case in San Diego, as I recall. The perp had a knife. He kept getting closer and closer. The officer could not come up with a decision point to fire. The perp basically walked up to the officer and disemboweled him, as I recall.
It is a bad idea to approach an armed person with a weapon in your hand, and refuse to respond to orders to stop and drop the weapon.
You are twisting my words and/or projecting.
I did NOT say she should've let him get within striking distance. I DID say that when she started shooting the guy was quite out of striking distance and NOT approaching her at any rapid speed (that Tueller Drill scenario that I was responding to, even if you choose to ignore that). Slowly stumbling is more like it. He seemed to hesitate in his approach, actually, but the footage is pixilated from that time.