Update: "Roar of the Sea" is on his feet
He's using his DF techniques, but the whole dynamic is not clear...
Drake is facing him and the attacks are not injuring him, he has the "...!?" balloon but is not clear if he's reacting to Apoo or to Sanji's words which are broadcasted on the Live Floor.
Beast Pirates are getting hit by Apoo's sound waves tho, what do you think? Is he trying to join the Alliance? Is he attacking the Alliance too and going solo?
Next chapter we'll probably have more answers but now is the time to speculate
Votes can always be changed