"There are three things that I insist you must take note of," Lin Feng looked at Xiao Yan and impressed upon him, "Firstly, you are still not exactly adept at merging the fires, so you should not use it as you wish. You should know very well that this is still an incomplete technique that you have not mastered completely."
Xiao Yan nodded; he agreed with this judgement: based on his current level of mastery, the risk of merging the fires remained high like walking on a tightrope. If something was amiss, and he failed to merge the fires, he could end up immolating himself.
Merging the two Primordial Flames was his ultimate killer move. Unless absolutely necessary, he would not use it.