He had a breakdown because I made him feel guilty about what he did. I was standing behind him while that was being recorded. [So while Sans might be partially responsible, as far as Sans is concerned Dylan put himself in that situation. But also, that was a recording where Sans was actively using the ability, not an aftereffect of it.] That was the second time I did it. The first time I did, he recovered enough to try and kill someone. [So yeah, he went back to normal. There's a hint of bitterness there, if Papyrus is paying very close attention--Sans considers that a mistake he made. He should have gotten it done before anyone else got hurt. But hey, what else is new with him?] If I did it with you it wouldn't be something negative.