Eimi defeating Rahdan. It was actually quite fast!
It starts at 13:50 and ends 3 minutes later. It was the third attempt in this stream it seems.
https://www.youtube.com/watch?v=i5fZALzP-40&t=830sAnd after defeating him, she just casually plays another hour and 45 minutes to make it a 2 hour stream. Nice.