I made a discovery which will clear the air about this popular still from "His Red Right Hand: http://img29.imageshack.us/img29/7037/4sh2.png   While blurry there's resemblance to Jack Plotnick's slim elongated face and hooked nose. It's the type of fast paced action sequence where stunt people are used the majority of the time. After digging around a bit, I can categorically state that the face we get a glimpse of belongs to this stunts actor:  http://www.imdb.com/name/nm0189587/  (scroll down to see his credit from that episode). 

P.S. - I love Brett Partridge and wish he had a more regular role than the occasional crime scene cameo. 

P.P.S. Has anyone found out who plays the 'The man in the red sweater"? (I've IMDBed for him more than I care to admit)