Finishing with 72% health left could be considered a massive advantage in the group arena.
Because this sort of advantage could stack in the group arena, the group arena was very different from individual matches, though it might seem that they were both 1v1s. In the individual competition, all you needed to do was beat your opponent first, but in the group arena, you had to consider how to use the least amount of HP possible to defeat your opponent.
Efficiency. The group arena valued the efficiency of your attacks far more. In the round that had just ended, Sun Xiang had doubtlessly managed to exhibit that excellently. Using positioning and patience, he had greatly diminished the space his opponent had to perform, winning very efficiently.
A player who usually depended on hand speed, mechanics and technique to win his opponents had suddenly decided to switch tactics and lure and trap his opponent, even managing to trick the Master of Dirty Play, Fang Rui.