Neither, he obviously used his awesomeness to cut the mountain in half.
First Law defeated Smoker... Then, one of the Yeti Brothers. Finally, Vergo in one swing add on that cutting what appears to me a whole island "horizontally". This might goes far beyond Mihawk's swing cutting an ice mountain at Marineford.
If that's the case, you wouldn't be surprised why Law was curious and at some point pissed wanting to know what Rayleigh would want with Luffy... It seems Law figured it out that Rayleigh is gonna train Luffy... so Law did the same thing on his part training for 2 years.
You can tell the gap of power level of Law before and after Time-Skip. Makes you wonder if Law got that much strength in only 2 years. How it would be with Kidd and Killer?
and even worst. You can't imagine Shanks, Marco and Mihawk. They must be way~ much stronger than Supernovas.