Sidon didn't have to give it voice, it was a thought Link shared.
Despite his desire to not get sucked into a Deep And Serious Conversation, he'd be insulting if he kept shunting everything to the side. Mipha deserved better, and Sidon deserved to not be treated like that.
So with a deep sigh, Link moved to stand more next to Sidon than between him and the Domain. "You felt it too, huh?" he asked softly.