After Vesa gave them some more advice, they continued to practise for the rest of the day. After that fight, the following fights weren't exactly in Lukas' favour, they were much more even. Lukas still won more fights overall, but Oak had won a fair amount himself, and only grew more confident and competent as the day carried on.
By the end of the day, they were exhausted but had learned so much about how each other fought, as well as places they could improve thanks to Vesa. Oak was far more tired than Lukas, who could preserve his energy better than the eager sole member of his subdivision.
When they were done, as Vesa was explaining a few more ways in which they could improve, Oak lay on the ground with his eyes closed, only focusing on his breathing. Their previous fight, and their last for the day, was quite exhausting compared to the rest and pushed Oak to his limits. However, he did eventually best Lukas.