Check the description of his guards. It gives you the input commands. I.E. you don't even have to use him once to know the inputs.
Tournament signature by Galadin.Spoiler:
Maelstrom (ground) startup frame is 391F (6.5sec), which is 1 sec faster than the midair version.
Lazy me. Only tested the midair version and assumed both are the same before. Sorry. =[