An insufferably long, extraordinarily boring summary written by yours truly can be found here. A sample:
Back at CTU, Barry is making no progress with Chloe who is still a basket case. In a move sure to endear him to Porn Star Kimmy, Jack informs the shrink that THERE'S NO TIME for the rather clinical way the Clinical Psychologist is working with Chloe. To prove his point, he applies the Jack Bauer Death Grip to Barry's throat which seems to wake Chloe out of her stupor.
While difficult to ascertain, I believe I saw Kim's eyebrow twitch when Jack was choking her lover which means that Ms. Cuthbert has added a third facial expression to her acting repertoire, the other two being a come hither smile and her famous teenage pout face that she used to such great effect when trying to get Chase to quit CTU in season 3.