Analysis courtesy Brian, per usual. Original Picture Pages at http://mgoblog.com/content/picture-pages-stunting-veer.
I apologize for the lack of slo-mo this time around; my video editing SW seems to have a mind of its own and decided 'no slo-mo for you!' OTOH, my lower-case letters are actually lower-case this time, so there's that.
Setup: Purdue comes out in the Wildcat with WR Justin Siller at QB, which immediately causes anyone who remembers the 2008 game to break out in hives. Then they realize that Greg Orton and Kory Sheets aren't on the field and they relax a bit. Michigan tips that they're going to drop Roh into coverage (Brian's original PP says he plays standup, but really he's just late to put his hand down) and stunt Ryan behind Martin (shown by Ryan lining up a yard downfield from Martin).
Wha'hoppon: Ryan does indeed stunt and Roh does indeed start to drop, then he reads the mesh point and heads for the edge to contain the outside run. Siller reads Demens heading outside as well, so he keeps. There appears to be an opportunity straight up the middle, as Purdue has two linemen heading downfield and nobody's in the hole...
...except Ryan. The pulling RG doesn't see him stunting into the hole and chooses to double RVB instead. The LG does see him but is too far downfield to pick him up. Ryan gets practically a free run at Siller, and it's only Siller's agility that makes this a regular TFL rather than a semi-vs-Smartcar moment.
Full YouTubage at http://www.youtube.com/watch?v=fzm-mAPvcw8.