Once upon a time. . . Many Genocide Routes have been played over and over. You are used to seeing Asriel at the end of Snowdin. Instead, they saw an old friend, Chara, that you weren't supposed to see yet. Chara had gotten sick of watching you kill everyone they loved over and over again. You started a new Genocide Route, and Chara was inpatient. They didn't want to see the dust of his own brother again. So they stopped Asriel from trying to capture the human in Snowdin, and Chara tried to take care of it themselves, but they failed once again, and they died. Asriel was now the one to watch his friends and family die. . .
You found yourself finally back at the Last Corridor, but now, you saw Asriel standing halfway through the Corridor instead of their sibling. He seems so sad.
Asriel: "So. . . Howdy, human, it's me, Asriel. This is new for you, isn't it?"
Asriel looks down at the tiles of the ground, and he seems to be holding back tears of grief.
Asriel: "Human, I know I'm supposed to hate you. I feel like I'm supposed to kill you for the things you have down to my friends and family, but. . . I can't bring myself to do so. It's just against my morals."
Asriel rubs his arm with his paw. He's clearly miserable, and he misses his friends, his dad, and Chara. You feel a slight sense of guilt as you see the poor goat.