That was classic Muir: Go hard from a long way out and get so far ahead nobody can catch up at the end.
This is how she won the Paris DL in 2016, just weeks after she bombed at the Olympics. She ran 3:55. At the time, only Dibaba had run faster this century. It wasn't until Worlds in Doha 3 years later that Sifan & Kipyegon ran faster.
IIRC, she won her first DL at Bislett the same way.