sorry,my english is not good,but you need kill second group of enemies to continue the story.If you really feel diffcult.please go to the start menu, in“在此输入作弊码” in the bottom left corner, type in "add UI magic" to get the spell, and then go to fight the second group of enemies.
or you can in In the course of the battle to press "TAB" to change attack mode,see if you can beat it