First, everybody close to her and attack!!!

You need not to see emma's havior to know when she use short-range wave.
Just focus on long-range wave.
It is not hard to see.
She use long-range wave about 1per/sec.
She use this skill continuously 5~7 times.
When the long-range wave not apear on time, you should go far away from her.
That's so easy