Nope. Even if I was, he could have simply looked at where the gun and shooting table were pointed and would have known I wasn't shooting silhouettes. If this had only happened once, I could overlook it, but this has happened twice and it was the same guy both times.
If you see him again ask his name.
I will say though, on several occasions I have had to get after some 50cal shooters who looked like they were shooting what they were supposed to be shooting.
But when they thought no-one was watching they swung their rifle over and took shots at the silhouettes.
I was standing in the clubhouse watching them after hearing the loud boom of their gun.