Vertigo. Boruto trained for three years and learned how to give his enemies a bad case of vertigo.
Sorry, I know this is supposed to be a serious, badass moment. And neutralizing someone by sabotaging the flow of their own chakra is pretty cool. But I see Code repeatedly pratfalling across the panels, and I can't help but laugh.
FYI, in real life severe vertigo can be extremely disabling. I actually had an older family friend who technically died because of it (she fell and hit her head while nobody was home). But in a shonen manga with lightning spears and giant snake summons, "defeat by dizziness" is a humiliating way to lose, even for Code.
I keep rewatching the spin. i'm guessing when he did the short spin the other direction it was to try reverse the dizziness before he hit the move. also love how everyone starts cowering in the corner when the spin starts spiralling around the ring