While I might presently agree, I'm not presently an 81-year-old female (with two bad knees, according to the article). Heck, even if I have two good knees forty years from now, I still might not issue any verbal commands prior to firing on an intruder who's in his twenties.
Action often beats reaction, especially when one's reactions are slowed by age.
In any case, I would strongly recommend against engaging in conversation with an intruder. Order him into the felony prone position and call the cops. Remember, age isn't the only thing that can slow your reactions. We've all at least heard how engaging in a conversation (on a cell phone) can affect your reactions while driving, right? Don't let the intruder distract you by talking (or doing anything else, for matter). Maybe he's got a buddy sneaking up behind you.
Order him to prone out and shut up - Mark