If you think that what KG did is the same as what Carmelo did there is something wrong with you.
KG backed up enough to get free of all the arms grabbing at him but was prepared to fight the entire time. He was basically looking to get into a comfortable/effective fighting distance.
Carmelo hit someone then retreated and was not prepared to fight if anyone got into arm's length. His only goal was to get as far from the fight as possible.