EZY
I do believe you were told it, but I don't believe it happened. If you heard someone shout something from an aircraft, would you walk over, through the prop arc, to find out what was being said?
Nor would anyone else.
And why didn't the chap start immediately after saying it? Why wait 10 seconds for someone to walk into danger?
I shout loudly, even when I know for certain that I am the only person at my strip. I will continue to do so, as well. For me, its just part of going flying.