You're not kidding?
With the main off, how could he get a shock?
Why should he get a shock even with the main on?
Have you ever heard of anyone getting a shock who had to call 911?
Geez

And I **really know** the main was off from where I'm at? Geez
yourself.

He's probably got an old Federal box from fifty years ago and for all
you or I know could be standing in an inch of water.