So, After Dust Sans entered unknown AU and killed many humans in there, destroying their Souls and victims ranged from innocnet child's to full-grown adults cops... but as you look at alleyway, you didn't entered it and ignored... Which didn't angered Dust Sans but when you sit on bench in public place(park). Dust Sans came from alleyway and sit down with you as he pulls out a cigarette and lights it on as he puts it into his mouth and smokes while his face was shadowed by his hood fully.