Full Q:
what does Murder!sans think of Killer!sans?, well if he ever met Killer!sans or at least heard about him.A:
Officially, Murder!sans hasn't met Killer!sans yet, but if he does, he will be wary of killer!sans' high LV and keep a distance from him. After some knowledge, he will think of him as another end(or possibility?) of him, but he will not sympathize.
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Canon Murder!Sans / Dust!Sans Facts
General FictionAll of this information was taken from the "Ask-DustTale" tumbler page → https://ask-dusttale.tumblr.com (Also the page is open to questions and is still answering. But I think you should read a bit to make sure you're not asking the same question...