A very fierce method! However, Jun Moxie wasn't regarding this method as 'fierce' or even 'ruthless', but as simply necessary! Each individual attack of this series was fatal, and their combined impact over such a short duration had made them even more so!
The reason he considered these attacks to be necessary was simple: Their path was being obstructed by a Jade Mystic, and the only way to get out was to either use the Yin Yang Escape law or go for overkill without using his Mystic Qi since he was well aware that he couldn't break through a stronger enemy's Mystic Qi protection! In case he used the Yin Ying escape law to get past the man, he was sure to stop and kill his guards!