Oh. You want to know how it happened? Well it went like this..
I was sorting through some old files when I heard yelling outside. "I don't wanna bother him! You know he hates being bothered!" "Well someone has to get him!" I poked my head outside my door and said: "is there a problem here?" "Dr.Gaster! Sorry to bother you sir! Never mind that, what is it? There's reports of a human is Snowdin, and the king wants you to go to your station. Alright, thank you. I teleported to Snowdin and saw monsters running everywhere, trying to evacuate. I stopped Grillby and demanded to know what was going on. He told me that the human had attacked someone, but no one was sure who. I ran through Snowdin trying to find Kin and Pap. I turned a corner and was shocked at what I saw. Pap was dusting in the snow, and a human was standing over Kin. I was blinded by rage and I started attacking the human. I thought he was done for so I turned to Pap to check and see if I could save him. "Please Papyrus! Don't die! Stay strong!" "Dad, I love you..." He faded away in my arms. I was about to turn to grab Kin, when I felt a price of pain in the back of my head that barely hurt. I grabbed the human and threw him against a tree repeatedly. Once I was sure he was dead, I sent his soul in a jar to a royal guard to bring it to the king. I reached out to Kin, but I was blinded by all the blood streaming down my face. I didn't remember getting hurt this bad, but I knew I had to get some help. I grabbed Kin and ran to Lady Toriel's house.