It wasn't only him who was affected by this goal. There were others too. In particular, Shun should be the most devastated.
But now, was he going to leave him? Sure, he appeared to be a lost cause, a person beyond saving. But still, he couldn't leave him now, could he?
Though not out of pity, he decided to stick by his side and try to console him.
"We all make mistakes now and then. But, if we let it bother us then we won't be able to advance. So, learn from your mistakes, Sato. Don't let it hinder you," Hiro said, trying to alleviate his worries and guilt.
He wasn't good with words. So, it was the best he could come up with at the moment. Now, it was all up to Sato how he wished to interpret it.