It's just an entry animation showing that he is warping in, but he hasn't really done so. He just starts off from there. If he did warp in, he would warp in from the air if the 'Devan boss' event was placed in the air. Instead, Devan warps in on the ground and doesn't fall in, like Jazz's start positions and warps. Also, he can't morph at will either, not until his first 100 hearts are lost.