Just spitballing, but could "Blow Ball" (it does look like that's just what it says) be some reference to
"Home Run" Crooks' notable four-bagger performances [
https://sabr.org/bioproj/person/35101e5e ] ?
As in "And now the air is shattered by the force of Casey's blow." "Blow ball," as opposed to "small ball"...
Ehhh... probably not. Almost as much of a stretch as that old thread about Deacon White / "McCreachery"
[
http://www.net54baseball.com/showthread.php?t=159990 ]... Sorry we even brought it up...