Talk:Sans/@comment-5513888-20160208065735/@comment-27555277-20160208080029

Obviously he's too lazy to actively do anything ;)

For real though, I kind of took him cropping up everywhere as his means of helping you, even beyond seeing a familiar face. In his two dates he gives you backstories and a bit of intel. He plays along with the concert thing if you continue with Shyren long enough. He sets up an illegal hotdog stand in the one region of the game with a particularly huge gap between places to buy items. Some of his locations in general seem coincidental, but they could quite possibly be deliberate. Like how he sleeps at his post when you're chased into Hotland. It seems like he's just slacking and ignoring you, but with how infuriated Undyne was it's obvious he usually doesn't/wouldn't let her catch him (Meanwhile, if you kill her, he isn't at his post. You'll be at level 8 if she's the only person you killed, which is the last level that Sans will finish his true judgement statment with "I don't know, I wasn't watching"). Some of his other placements seem a bit specific too, like before the rock waterfall (Undyne says she only recently put a bunch of rocks at the top, possibly while she was waiting for Papyrus for their meeting), near Dogamy and Dogaressa's station, etc.

Beyond all of that speculation, though, two obvious ones are 1) he presumably doesn't tell Undyne about your whereabouts, and 2) he doesn't kill you straight out of the ruins. You ought to be thankful for those two alone ^^