Its only dawned upon Rosen himself that perhaps this is why, beyond a daze fueled by adrenaline and rapid heart rate, he doesn't feel distraught. The sense of upset and helplessness he should feel have been delayed in coming and now he wonders if they will come at all.

"Thank you."

Its a strange thing to have your sanity confirmed by a talking skeleton, but he will take it for the moment.

"Then let me ask you, Sans, when the monsters and the humans became divided, was there a singular reason? Was there a specific catalyst for the war?"

What had been the last straw.