Yes, so hours, minutes and seconds will catch back up to the first set of hands which have continued to move when you pressed the split button. The important thing about the triple is the addition of the hours ticking over from 0 to 1 and so on. Where as the double only has minutes and seconds
I think it means that you can take a split time at 0:55.55 and another it will still show the correct stopwatch time at 1:05:05