Heavenly Sword Ch 4 - On Silent Wings
Once the door is open you will see more ninjas fly in. Take them out.
They will be backed up with the heavily armored guards.
When you've killed everything here proceed through the open door at the end of the walkway. You will find a wheel that raises a statue in this area.
When the statue is at full height, run over to the shield box and grab a shield.
Throw the shield at the statue's shield and afterTouch it to the gong that is across from it.
This part is pretty tough, because the statue will drop back out of sight in a very short time. You have just enough time to pick up a shield and afterTouch it to the gong.
When the gong has been rung the door will open.