The Detachment

Au's aren't meant to collide. the seasons, in an ideal timeline, would never have met at least not this way. in the ideal world, Summer would still think that there was only 1 sans. in an ideal world, he would still have his Papyrus, and so would Winter, Autumn and Spring. they wouldn't even know the other exists. In the ideal world, Summer would still be wondering if the theories were correct, wondering if there was a bigger multiverse out there.
but this isn't the ideal world. it stopped being that the second the worlds ran into each other, killing everyone but Sans.
well, four of him, actually