How do you defeat the bludger in the quiddich stands?

Ok, so to defeat the buldger, see that thing in the right corner, it's kinda like a roof with a pole you can stand under it. You've probably noticed that the buldger is after you. When it's about to attack it has a red arrow surrounding you. You stand right infront of the pole and when you see the red arrows get out of the way. The roof will
Become a ramp. So run up it. Then you levitate the two boxes in the right corner and break them. The is a box behind them. It is another buldger. So again, stand infront of the pole run up the ramp and climb up a ladder you will see. Level done!

Every few seconds two red circles appear on the floor around Hermiones feet and circle around her. This is indicating where the bludger is going to move to next. Stand still and wait for the red circles to appear, then quickly run out of the way. The bludger will knock down the support holding the ramp in the air (in the top right corner of the first floor). Stand in front of the support until you see the red circles appear then move out of the way and the bludger will smash into the support and bring down the ramp so you can move up to the second floor. Do the same again on this floor but you have to stand behind the large boxes and blow it up