(I think of Frisk as a girl, so XP)
Frisk was in the middle of the group, watching Andrew scare Jackie, Sky yelling at Andrew, and Dusty defend Andrew. She liked hiking around, gave her a time to be calm and happy, especially since she was one of those extraordinary nice people who disliked violence. The fall leaves made the forest seem better, and seeing Chara sticking with Jackie, she knew that only Jackie really understood her most, but she felt like she would soon understand her as well.
(idk what im writing XP)