Phoenix Cleansing Burning Lotus

As those shadows from Second Shadow's Dark Assassination technique were approaching, they felt the air resistance getting higher and higher, until at some point in time, the air flow had turned into an uncontrollable tempest. It was like the area around Elyra was the center of a battlefield of many wind elemental cultivators, and a single step forward, required those copies to wage war against the wind. 

But Second Shadow knew that he wouldn't be able to escape from Elyra's clutches, if he didn't win this battle, so instead of trying to retreat, he sent his shadows first, as a form of a sacrifice in order for him to advance.