Racine thoughts
What Elliot Ness unexpectedly experienced when he spotted da recently-eliminated-at-da-hands-of-da-Mob Malone's street-address written on da matchbook-cover carried by Frank Nitti inside da courthouse, and realized dat Nitti must therefore have been da murderer.
Elliot Ness may indeed have begun having "Racine thoughts" upon seeing da address of his deceased friend written inside da cover of Nitti's matchbook, but then his mind REALLY started to "operate in turbo mode" when said slickly-attired hooligan yanked his gun back out and started majorly shootin' up da place!