User blog comment:Varzan Deodinm Beldinm/What will Episode 3 Have in Store?/@comment-11346598-20140807192157/@comment-96.254.157.84-20140807223754

I'm not saying Mercury fights first. I'm saying it might be Phyrrha vs. Cardin like in the trailer, then after Cardin is beaten, Mercury volunteers to fight Pyrrha next.

It's probably as a friendly spar and not a torunament fight because the students are still in their uniform.