Vincent had a smirk on his face when he made his move. Of course, it's because he caught his opponent off guard. Everything happened so suddenly and with such ferocity that the crimson one failed to move his katanas out of harm's way.
Boom!
Boom!
The crimson tails that suddenly extended out of Vincent's back smashed on the bursting katanas, causing them to explode. The shockwaves landed on Vincent's back, just as he had intended. The force suddenly applied to his back increased his speed by two times, and Vincent endured the pain in silence. His bones were creaking, and his heart was throbbing, but he was willing to pay this painful price for the sake of victory.
Charging straight towards the crimson one—it was a suicidal move.
However, Vincent had no other choice. He knew that his body wouldn't be able to hold on for long, and that's why he gave it his all in this exchange.
He was giving his all because of many other reasons.