take a look guys at the last sneak peek.

http://www.spoilertv.com/2013/11/the-mentalist-episode-607-great-red_13.html

look at haffner, first hi was sitting on stiles right hand and then on stiles left hand next to the door,
i think he tried to escape after what lisbon told him; that PJ thinks he's is RJ.
so PJ fired the shot we heard, to make him sit down again.
we still have to know what happens few minutes later before lisbon arrives and everything explode.

i personaly think that the young actor nick nordella that we're going to see in E08 will play the roll of McAllister only because of the cleft chin (the dimple in the chin) they both have, and no other blue eyed suspect has it. and more, before the explosion McAllister kept his hat on the couch with his hand on it first, i doupt there was any explosive in it but it's just a remark, he could've kept it in his car at night.