I don't remember. Whatever worked. Lol. It seemed a bit random how quickly he'd crouch down. If he does so pretty early, it shouldn't be too difficult to take him out. But when he messes around, and doesn't crouch right away.. Not really hard, in my opinion. But annoying to deal with.
It was random on when he'd do it, but once he did it was just a matter of dealing with the constant shaking. Luckily half stabs were in just the right frequency to get in good damage and not get shaken off the charge.