This bombarding gunfire was, undoubtedly, under the command of Lion.
When Olian was injured and fell, Lion and Xiao'ao had already discussed their countermeasures. Because their combat power was lagging behind, they had decided to win by novelty where they would take their enemy by surprise. To put it across bluntly, most probably they would not win if they were to fight in a head-on confrontation, so they had to play some tricks in order to win.
The entire plan was divided into two parts. Xiao'ao would be responsible for one part, which was to find a chance to assassinate one to two of the Legendary Masters from their opponent's side. The other part was Lion's job, which was to render Xiao'ao with assistance whenever necessary. She also was to create diversions to confuse their opponents to hide their real agenda, as well as to deliver the final, crucial blow.
