I think he did a fair, albeit long-winded, job. He reminded the jurors quite clearly that this woman, with all of her inconsistencies, lies, changes of stories, etc. is the prosecutions MAIN WITNESS. She is the person the prosecution has put forward to PROVE BEYOND A REASONABLE DOUBT that George Zimmerman pursued and then attacked Treyvon Martin, fatally shooting him.
And what Ms. Jeantel did was show that she has lied about elements of this case, been confused about this case, changed her mind about elements of this case...and, at the end of the day, only HEARD bits and pieces of an event. AND...it sounds like in her recollection...Treyvon Martin got away from George Zimmerman and was able to walk into his home and safety...but for some reason chose not to...he ran until winded...but somehow when he turned Zimmerman was "right there"...but she can not say whether he ran away from Zimmerman and Zimmerman somehow managed to keep up with him...or whether he ran away...and then ran back to Zimmerman to confront him.