Leo immediately turned to the other side and saw a bunch of members coming in from that side. He could sense 15 people rushing in from there. They had all heard the sound from the earlier Flame Burst.
Since the group that was coming in from the other side was not expecting the magic attack, none of them put up any form of a shield, and all of them were directly hit by the Flame Burst. None of them survived. They were a total of 7 people who got caught up in the attack.
The latest Flame Burst created enough sound for the new group to be completely on guard. Even though a lot of them were very drunk, they still put up shields when they walked in. When they got there, they didn't see anyone. All they saw were the leftover burnt corpses.