The vantage point of the elves high up in the trees granted them an overhead sight of the battlefield. So they noticed Kelvin barreling his way to them.
They began issuing orders immediately for the defenders to concentrate in his path. It was all to no avail.
No one could stop him. And when there was someone who could stop him ahead, he would sense it with Extraordinary Perception and veer away to avoid it before they met. This created the illusion that he was unstoppable.
With his superior speed, he continued to kill his way towards the objective. When he got close enough, he jumped above the defenders in his way and smashed into the white tree behind them.
The tree felt like it was made of bone. He wouldn't be surprised if it was. It was so hard that his face hurt when he crashed into it.
He didn't let that delay him, though. The diamond blades he had for arms were no strangers to bone. He knew how to cut bone very well.