I came to that same conclusion independently. Imagine that you are Oswald looking through the scope and seeing what happened. Now there’s a “WTF!?” moment if there ever was one.
Imagine that this sort of testimony comes out under any sort of questioning or coercion? It also neatly explains why he simply had to go bye-bye right away. No trial or waterboarding allowed, and a phony balogna “investigation” handled very carefully.
You are exactly right.