I was impressed with Khan's performance. Offensively, all the tools are there. He has a good jab, can lead with either the left or right hand, can lead with either head shots or body shots, knows how to put his punches into combinations, knows how to punch off his opponent's punches, offensively he is very polished for 20 years old IMO. He does get hit with a decent amount of punches, so his chin will certainly be tested at some point.
The knockdown was nothing but a slip/leg caught on the rope. He was not hurt at all.