I apologize for not making my poblem clearer in my previous post.
The Exercise 12.5 on page 36 of the Tutorial wants the programmer to update the script with a different response if a player repeats "use defibrillator on Bob."
The answer to the exercise is at 26.1 on page 72, but I do not understand it. I changed Bob's properties to "not dead" as the Tutorial instructs, but I don't know how to cause a different response to display when the player repeats using the defibrillator on Bob.

If you change the defibrillator's use script to match that in the tutorial, then you have updated the script with a different response. When the player repeats "use defibrillator on Bob", they will see the response: You’ve already revived him and he probably wouldn’t like it much if you used the defibrillator on him again.

Yes, it should probably be made more clear that the script in 26.1 should be entered into the defibrillator's "use" script.