[The notion that they might have been just missing each other for a while is interesting, but nothing he finds worrying. Thinking back, 'spiraling' might be a generously simplified description of his path. Something a little more wavering in its outward motion, as he changed his mind about whether to search openly or search sneakily a few times along the way, would be more like it. But roughly parallel... maybe.]

Oh, I heard from Nagito! He was staring at some footprints... Deciding on the best path to check.

[Maybe the cyborg had initially been deciding whether to join in the search, or whether to direct others and encourage them on their way... But by the end of the conversation, Nagito had clearly been decided to search and hopefully help Sunny out.]

I don't think I've actually met Sunny yet... So I had to ask for a description.