From the information available so far it would appear that neither approach continued to the minima. Both missed approaches would appear to be commenced from about 1000' above the aerodrome which would hint more at not meeting stabilised approach criteria, possibly due gusty winds. Given the casual sounding radio calls when the missed approach commenced it would appear that the control issues started after and not before commencing the missed approach.
As others have mentioned a lot of training is done on missed approaches from the minima, often on one engine. A missed approach from higher, earlier, and at light weight can be completely different. All it takes is a bit of finger trouble (easy to do when tired) and all of a sudden you're in a completely unfamiliar situation with different modes, attitude, and performance from what you were expecting. When was the last time any of us practiced unusual attitudes at 2,500' instead of 30,000' as part of our cyclics?
The ATR72-600 that crashed in Laos a few years back is a good example of how quickly a missed approach gone wrong ends up with wild changes in pitch and roll trying to recover and then running out of sky.