I was playing a 2/5 PLO8/b and flopped the nut king high straight. My opponent flopped the top set. Flop was KQ9 rainbow. He had KKxx and I had JT98. He leads out(heads-up) and I re-raise the pot, it was like a $450 reraise.

This will put him all in, so he asked me if i wanted to run them twice. I had never done it before and I agreed. I won the first run and he hit boat on second run.

So we split the pot. Are there any advantages, say when your opponent has no re-draws, or certain situations in which one person has an advantage to run them twice?