to put it simply, he tried "dipping" into the atmosphere to slow down without reentring completely. Like they did with the appollo missions that returned from the moon. Those pods carried so much speed that it was impossible for them to enter earth's atmosphere in one go. So in stead they enter the upper layer of the atmoshpere, lose some speed, get back out of it to cool down. Rince, repeat untill you lose enough speed to make a safe entry.