Post by John McAdamshttp://youtu.be/sdO5ixuMr1s
He recognizes that he either didn't hear or didn't recognize one of the
gunshots because of the roar of the motorcycles but for some reason
believes it was the second shot he didn't hear rather than the first. If
he didn't hear it, he would have no way of knowing whether it was the
first shot that he didn't hear or the second. Evidently he bases this
belief on what he was told later, not on his first hand experience.