The comic itself has enough context. Frisk decided give their soul to Asriel. That's why you can see the dialogue box from the game talking in first person; that's Frisk's soul inside Asriel.
And of course, Sans isn't happy one of his best friends is now dead and it seems he blames Asriel for it.
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Platus Moderator
Oct 16, 2015 at 09:57AM EDT
Strate77
Oct 16, 2015 at 03:19PM EDT in reply to