underbelly, ashes

This season now will move forward without Tebow. It will leave him behind in the underbelly of that stadium, in the ashes of a 45-10 dismantling, as the NFL rushes back into a direction of normalcy that includes names like Brady and Manning and Rodgers.

underbelly 

c.1600, from under + belly. In figurative sense of "most vulnerable part" it is recorded from Churchill's 1942 speech. Sometimes used erroneously in sense of "seamy or sordid part" of anything.

http://www.etymonline.com/index.php?term=underbelly