[Nagito is not particularly familiar with telling people his plans before he does them. He sees Sunny run out of the therapy session--and really, it's kind of a surprise it took this long before someone did that--but he also sees people go after him. It's better if other people deal with it; they'd be better at it, surely.
But then it turns out Sunny didn't just run off to go hide in one of the shelters or something, he left the oasis entirely. And Nagito can walk around the desert, if nothing else.
He tracks the footprints as far as he can, which isn't very far--the sand shifts pretty quickly. It gives him a general direction, but that's all. Then he uses his usual method for these sorts of things: he just picks a direction and starts walking. By himself. Into the desert.
OTA, just searching
But then it turns out Sunny didn't just run off to go hide in one of the shelters or something, he left the oasis entirely. And Nagito can walk around the desert, if nothing else.
He tracks the footprints as far as he can, which isn't very far--the sand shifts pretty quickly. It gives him a general direction, but that's all. Then he uses his usual method for these sorts of things: he just picks a direction and starts walking. By himself. Into the desert.
It'll work out in the end, probably.]