That was what struck me too and one of the reasons I bought it; the photographer was lucky or good enough to catch the bag at the apex of its swing. Really sharp striking images are works of art.
Here's one of my cousin:
Dempsey, Trinidad y Hnos premium:
My favorite of all is Marciano hitting a heavy bag called "Jersey Joe Walcott"
I don't have a Type 1 photo, but I got the card, which is nice...