every timeline reset Toriel has to suffer losing her child or being killed. This Toriel has broken the code, she has figured out the endless cycle. She has become horrified of losing you again. When you fall instantly flowey gets burned and Toriel is already there hugging you desperately

my child… your here… you’ll never ever leave… I don’t want it… I don’t want to die… I don’t want you to leave me… stay… stay forever…