As a trainer, there are three thing that I need to know to get the most out of each dog I train. They are
3) working attitude.( The willingness to please ) This category can change with maturity, but in most cases do not.
Where they score in each, will tell me what to look for and what methods, I will use in their training.
Without seeing this dog, I would say that the dog rates low in the working attitude category. Knowing this I would not care how fast they did the drill, only that they worked through the pressure and did it.
Now to your post;
The only red flag I see is the dog is breaking down on Back nick back. Most likely confusion, I would go back and cement this and move on.