since i want to see how this'll turn out, I'll submit something for fun
Opha will fight and will use hit and run tatics, relying on his superior Sangheilian stamina to keep ahead of Chrono, and when Chrono is exhausted, he will finish the fight. (HALO PUN INTENDED)
After defeating Chrono, he will spare his life, and throw a grenade at Kharine, and become the new arena master (or will he?)