Henry found Totel, and Cobra! You have to remove the stone scarab to stop the ritual.
The power in the stone is keeping it in place.
This is the low-spoiler guide for "Stop the rite!" puzzle in Mutropolis. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.