Sans didn't think it would end like this. He thought the human named Frisk would have reset everything about now.... but no.. that wasn't what happened at all. Sans would freeze in place after seeing Frisk dust his younger brother Papyrus without any remose. Anger started to fill Sans after all the monsters have done to take care of Frisk, only to be mercilessly killed by her. But there was something else that started to fill Sans, and that was worry over where you could possibly be. You were Sans, other younger brother, who hasn't been seemily been killed by Frisk that.
Realizing this San was frantically looking for you, he couldn't lose someone else. So he searched and searched until he found your small skeleton form bleeding out, just recently attacked by Frisk, who left you for dead. Your body was halfway covered in blood tainted snow. Sans eyes widened when seeing his youngest brother Echo bleeding out.
" Echo! Echo! Wake up! I.. I can't lose you too.."
Sans lightly cried out as he pulled you out of the snow and cradled your small weak form.