Botty Trotty's post is entirely accurate, but doesn't this illustrate the problem with modern airlines' belief that they can distil everything into a manual and SOPs? By enforcing a single engine go-around procedure, rather than letting the Captain decide for himself, this could easily have resulted in the second engine failing a moment later and the aircraft being unable to land on the airfield, with much more severe consequences.
SOPs are important, but so is airmanship, and the latter is being sidelined, eroded and even prohibited.