No idea what triggers this (the defense?) but there four instances in this game of the QB dropping back and standing perfectly still until he was sacked:
http://mfn1.myfootballnow.com/watch/1825#325957" target="_blank"> http://mfn1.myfootballnow.com/watch/1825#325957
http://mfn1.myfootballnow.com/watch/1825#325979
The second link is immediately followed by another instance
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