Strike/out signal

[Rita C]

A young man who will be umpiring with my league is also working games for the
local high school association. I worked with him some on signals and pivot
yesterday. For his strike signal he had a point to the side. Since he was
turning his head to follow the point, and since he will be doing a lot of games
solo in that association, I suggested that he do a hammer signal for strike to
break the habit of looking to the side. So this means he has a hammer for
strike and out.

One of the critiques he got from the high school observer today is that his
strike and out signal are too much alike.

Is this a valid critique?

Rita