Upon finding his rhythm Nero could not help but challenge the others once more, hoping someone else would take him up on the offer that Clarissa took. None of them did.
Though truthfully speaking, that was probably for the best. Although he was easily able to fend off Bael and Clarissa, actually winning their spar was another story altogether.
Early in his fight with Bael, Nero came to an unusual conclusion, but one he had no choice but to believe. Every time Bael recovered from an injury, his body would grow subtly stronger in that area or against that attack.
Nero did not actually notice that increase in strength himself, but just arrived at that conclusion after fighting for a while. While Bael's increase in strength was more or less even across his body, the actual sturdiness of his body was not.