Kind of depends on how many points you’ve invested into Iron Hook, so the skill’s duration would be very important for that set up. Also, can you cancel Preparation’s animation with another skill [edit: because if you move, Hook cancels along with Preps animation]? A C2 Fencer will have to answer that for us. If not, then yeah it would take too much time, Prep’s anitmation is rather slow.
A good combo I’ve stated before is Hook > Keel > Helm Chopper / Seism > Cleave x2 if they stunned. You can further their immobility with bash, since the knock back will apply even when they are already down. You could also Dust Devil but the immobility is so short lived, just better to try to save that for a Lunge + DD combo when you can work it in.
