According to the rules, when it was a four against one, the party that outnumbered the other could only make one move. Two moves when it was a three against one and three moves when it was a two against one. Once the attack failed, they would have to change their target immediately. 

Shang Xia fought one against two and suppressed Qin Daxing with his spear while sending out his Jade River Sword to keep  Song Yushu busy. However, their exchange had already broken the three moves rule.

No one expected the two of them to be the ones suppressed instead! The rule was there to prevent anyone from intentionally suppressing an individual, but it no longer mattered when the individual was able to take down the two of them! If they wanted to take technicalities into account, Shang Xia only used three moves to kick Qin...