I thought he was saying to Masipa: you should give us 10yrs and a nearly-dolus-eventualis.... the evidence with the ricochet foresight puts your verdict on shaky ground. But you can still legally and morally make up for it now by qualifying how grossly negligent it was.
How can there be such a thing as nearly-dolus-eventualis? Nel's point was quite sophisticated on this: the severity of the negligence is proportional to how obviously unreasonable the actions would have been to the ordinary man. He said for sentencing in this case, we therefore must be at the top end of negligence. His view was that the court, on the evidence, must have been very close to the dividing line between 'maybe he didn't foresee killing' and 'he must have foreseen killing'. He reminded Masipa that when the line is crossed into dolus eventualis, it is 15 yrs min sentence.
I think Masipa might just chew this up and spit it out, saying the dividing line is there to divide, but his point is much more sophisticated than that though imo.
As for a possible appeal on the verdict. Nel emphasised it seemed to me at least a couple of times "for sentencing", "for sentencing", maybe this suggests he has a different argument up his sleeve for later? He didn't say he agreed with the finding of foresight of killing, and it would be inappropriate, perhaps contempt of court, to say he disagreed with it at this stage of the proceedings.
It is odd though, I haven't heard a peep from any reporter since Monday about a possible appeal on the verdict... not even an 'I asked and didn't get an answer'.....?