I've read the Cockma skills, did a lot of theorycrafting, then ended up with this lineup. If I'm understanding correctly, I need to keep him dotted (burn), use block to defend my students and the ballista, activate it when the gauge is full... and that's all right? I'm having series issues trying to clear 49 with this setup because my weaker students (Momomido, Kokona) dies midway and I end up timing out. My Shimiko alone can't fully defend the ballista either and I end up do losing them. Been at it for 2 hours.