Wait, I didn't understand, they were winning right? Something happened?

I think I, too need to read it again. I am confused.

Something happened that most of Hans teammates died before they could advance the next level, so now Hans is down members that could've helped him reduce numbers in the next stage. At least, that's what I understood.

Yeah we probably didn’t see the loss. There’s multiple rounds and each of his team is not the absolute strongest even if Han is OP.