Dean's sword and Paul's fist clashed less than a second after they rushed towards each other, which resulted in an explosion of platinum and orange energy. Both of them got launched backward.
The impact of that clash was such that they couldn't withstand their own power. It was something new to them. It never happened before.
That first blow given by both was just a sample of the level that their battle could reach if they continued struggling.
Once they lost momentum and could regain their balance, they rushed towards each other again.
A trail of orange and platinum light was left behind as they danced through the battlefield and exchanged devastating blows.
