Er it has a pretty obvious tell just before its eyes start to glow it will start to accelerate as both the long stream and as the tornado, that is your cue to stop attacking and either air dash or drop to the ground and start blocking. It gives you huge attack windows, heck once you're inside the tower it has to try and pull away from you because inside the tornado it can't hurt you. Likewise use shotlocks they clear away the shadows from the orb super fast and rip the HP of it down real quick. If you're outside the tornado don't move just sit and block, not block counter just block, and don't move until it slows down again. The Devil's tide has really long cool downs between its glowing phases. Devil's tide can't really chain you either as all its attacks have clear openings in them so even if you're hit it's pretty easy to recover, which was for me a pleasant surprise after Demon Tower where you really didn't have any recovery chance.
He goes from red to black for like 0.1 second. You run towards him, he turns back and you're basically fucked because you can't react fast enough. Please don't tell me it's so easily judgeable when he'll do what because it really isn't. I got his worst shit, with this super attack coming all the time and him spinning over the whole field in like a second.
Maybe you were blessed or I was permanently unlucky, but neither did I ever have a "long cool down" nor did this thing have to get away from me to attack. At some point it just threw me out of the tornado in the middle of the attack giving me unbelieable damage.