"Who said it"... revealed

 "Say - there ain't nobody knows who The Shadow is - except The Shadow. All I found out about him was enough to make me call it quits. That guy was due to get me once - The Shadow was. I ain't boastin' when I tell you that I'm the one bird keen enough to spot him. Maybe there was others like me - if there was, they ain't around no more to brag. I get hunches that other people don't. There's somethin' about The Shadow - just his bein' on the ground - that I can feel."

Hawkeye_March, 1934