This appears to be a good job by the crew, with what look like multiple failures to deal with. One engine lost, another apparently not responding properly, hydraulic problems etc. Preparing the aircraft, and of course the passengers for an emergency landing, takes a much longer time than the non expert would think. If the aircraft is not falling out of the sky you take your time and get properly prepared, as the end result here suggests this crew did. Dumping fuel is only one part of the preparation. Rumour suggests that there were several captains on board and a portion of good luck. But then as they say the more you practice the luckier you get.