The stance (right forward) of the guy on the ground denied him the use of a powerful counter-roundhouse with his right foot, which could have been done had he been in a left forward stance instead. He could have still used a step-roundhouse, but it would have taken longer. Besides, that jumping kick would never have hit anyway. The guy didn't even need to block. And he missed a great opportunity to run away while the other guy was jumping. It's not cowardice to avoid fighting, you know. The greatest martial artist is one who never HAS to fight. It's something that every martial arts practitioner should know.
Still, this is an awesome photo.