After the whistle ended, Raizel took sometime to recover. After shaking his head and trying his best to focus, two dead bodies of the tengu landed in fron of him
That immediately got his attention back. He then began to dash forward, as he saw the other three leaping high into the skies. As he passed the two dead bodies, he could see they were bleeding a lot from their ears. That made Raizel surprised, and he was thankful that he didn't end up like them. For all he knows, that could be his fate. As he continued moving forward, suddenly, the tengu launched a barrage of feathers towards Dynatos. Raizel shook his head to keep himself focused. One, he trust that Dynatos is skilled enough to dodge it. Two, even if Dyna wasn't as skilled as he thought, there's nothing Raizel could've done to help him. All he needs to do now is make himself useful; by taking down the rest.
Raizel then started running to where he think they might land. He expect them to land together, or at least very closely. If so, he will launch a huge slash from his right side to the left, in a 160 degrees arc. If they land individually, Raizel will go ahead and attack the normal Tengu, and not the leader. Of course, he will take the advantage, since he has a huge window of opportunity to attack before the tengu lands to the ground. He will attack before they land on the ground, so that it has no chance of defending, he trust his sword(B rank), to take him down.
The reason why he didn't target the leader was because he expects the leader to be skilled, therefore if his attack was parried or block, it would allow the other two to attack him. But he hopes all of them lands at the same place so he can attack all of them at once.