13:45 Valkyrie with higher momentum slammed into a relatively "slower" spinning fafnir which didn't have any momentum, and had the disc advance and burst in the stadium. :^
Good question! After the other right spinning beys looses enough stamina, the left spinning beys give it spin because of how fast it's spinning, So it has no choice. They both keep giving each other spin depending on who's spinning faster. Which is called spin equalization. But if it were hand spin, the bey were hand spun, wouldn't pick up that kind of speed, so almost no spin equalization. But it will give it spin eventually because it will pick up at least the slightest faster rotation.
The only reason Fafnir won against strike god Valkyrie was because of that nothing break created by that fast launch. Otherwise Valkyrie would have cleaned up that round.