From ROCH chapter 27 - Fighting Strength with Wisdom:
Yang Guo knew Xiao Longnu was severely injured. The more they were
delayed, the less time for treatment there was. Anxiety filled his
heart. Fawang called out: “Be careful!” Suddenly the five wheels
returned again, coming side by side about to strike the two people like
five powerful waves. Yang Guo’s whole body strength rushed to his left
arm, the tip of his sword vibrating. ‘dang’ ‘dang’ ‘dang’ sounds echoed
as the sword brushed away the gold, copper and steel wheels. Everyone
was alarmed, dust flew up, and the silver wheel and the lead wheel were
broken, dropping on the ground.
One of the tropes of wuxia fights is one fighter talking to the other during the fight. Here, there is not even the pretence of civility between Yang Guo and Jinlun Fawang. So why does he bother to say "Be careful"?