Board Thread:Versus Battles/@comment-29853277-20180917044041/@comment-31165326-20180917051229

I mean, there was obviously something to burn with his sleep manipulation

It's all done with spellcasting, and he kinda needs a few seconds of buildup to teleport something. Of course, that's probably just dramatic effect for his final moments, but he does require at least a tiny bit of casting time.