Azaroth's current plan was to slow down this final battle as much as he could. He wanted to involve Dylan Ross in this final battle.
For that, he had to show that this was the first phase of the battle. He had some scope of making a big difference while entering this final battle.
For an outsider, the current situation of this battlefield seemed as though the Night Mountain Sect was on its last legs, and the Black Lake Sect was relentlessly attacking the Night Mountain Sect.
Dylan Ross was bound to go to the Night Mountain Sect in this situation. As someone who had the fate of a standard naïve protagonist, he was going to prefer defending someone to attacking someone even though he had no idea that the one he was defending committed more evil deeds than the one he was attacking.
If Dylan Ross tried to ignore this battle, Azaroth would forcefully involve him by making him fall to the ground. But fortunately for Azaroth, that situation didn't occur.