[ Sherlock doesn't interrupt this walk through the woman's past, instead straightening to watch with interest. He's absently taking note of the man's details that he couldn't see in the dim light moments before (left-handed, recent tooth extraction, knee surgery as a child) before he sees Irene shift just so... and realizes it doesn't really matter.

The gun fires a moment later.

Even in a dream the decibel is painful; his hands close over his ears moments before she puts the first bullet in one knee but it only takes the edge off, leaving a ringing in its wake when she takes the pistol to his jaw. This certainly adds credibility to the guilt theory. ]

You're quite handy with a nine millimeter... though I suppose that's no surprise, given your penchant for "misbehaving."