In the end, there was no final winner. The spars just went until everyone felt it was enough, and that to be more specific was after they got a solid understanding of each other's strengths.
For example, Luo could see that Muten was using a weapon he had practiced with but not the type of weapon he liked to use, and at the same time, he also used no technique. On his part, Luo also used just the most basic aspect of his technique.
Both had a sense of what their base strength was, they just lacked the knowledge of just how far each other could go.
And that extends to everyone, particularly Stella and Clest.