Jammed guns
No, that did not happen.
Morgan says so in his book but Sanchez denies it happened. He was only trying to escape and in a moment he was practically face to face (head on) with the Harriers and then he turned to escape.
In fact, Morgan's statement has been denied by Sanchez in an email to me as late as Dec 08, when I asked specifically that question.
"Mr. Spencer" I believe coincides that due to the speed and position of the planes at the moment, it would have been pretty much improbable for Sanchez to get (even by chance) in a firing position behind Morgan.
Pablo