User blog comment:Rainb0wSprinklz/Problems with the final confrontation between Granny Rags and Slackjaw/@comment-5469467-20121231032159/@comment-5469467-20130101083235

It should be possible to finish undetected, though I'm not sure if I managed on that playthrough. Also, I imagine a similar patch to the PC one would come out on Xbox sometime.