Now go tho the right. Don't use the stairs, just go straight ahead.
On the left you will notice two Triwizard Shields, but the way to them is at this moment blocked. You will come back here after Herbology level. So go upstairs, cast Carpe Retractum on the draw-bridge and on the right you will notice your third tap. Now you will get to the place, where salamanders will attack you. Get rid of them and cast Aqua Eructo (C) on salamander sources.
Use cauldrons to destroy two big pipes and you will get your ninth and tenth mini-shields.
Now go to the left, here you will find your third dragon statue. Now cast carpe retractum on two draw-bridges and walk to the next Triwizard Shield.
It's time to get a reward for finding 10 mini-shields. This is the easiest sublevel. Just load it and in front of you there will be your next Triwizard Shield.