Single Spey
There is a fundamental point being missed here. If I give an instruction to an ac to turn left onto North now (even if he is finals at 300ft), I expect him to configure the ac before commencing the maneouvre (ANC), that is taken into account when I give the instuction...
He was instucted to go-around, but gave the wrong response "maintain centreline", hence the ammended instruction.
Please don't get me wrong. He was put in a very difficult position, and the instruction would have been a "surprise" to anyone. The point is that your 747 pilot would have dealt with it, the poor boy couldn't, which returns us to the question, was he allowed to go solo too early ?