It might require a slight turn of the head toward the other guy to watch.
But that just adds to the challenge.
The guy reacting then has to reacquire the targets.
Anyhow, that's how we always did this exercise - with both standing equidistant from the targets.
It's a good one, either way.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”