So Toriel went downstairs and Frisk went too.She was worried about him being killed by Asgore with the regret of couldn't saving other humans.But as much as she refuses to get him out he was determined to go home.She says "prove me that you are strong enough to survive".She starts to fight him but Frisk refuses to fight back.But he was getting hurt and seeing it made her refuse too. Then she laughs and hugs him. Then his adventure begins