Also, neither Brennan, nor Amos Euins saw any scope on the rifle protruding out the window.
Neither Bob Jackson nor Malcolm Couch saw any scope
All 4 of these “rifle seen sticking out the window” witnesses were closer to the gunman at the SE window than Arnold Rowland was to a man seen by Rowland at the SW window at 12:15 and Rowland WAS able to see a scope.