As I watched this, my ego protected itself by saying "Well, she's shaving some range of motion off of those!" ...until she banged out each of the last half dozen or so from a dead hang.
The other night, I did 17 reps. My best ever was 29 reps (20 years and 40 pounds ago mind you), all from a dead hang. 2010's goal will be to get 30 "moderately clean" reps.
How many can YOU do?