Reeva could see how throwing him in the place would limit his ability to escape. The original effect of this place is to dissipate any mystic force that forms inside. Making it hard for Reeva to use happiness.
Then they use his happiness to create more of the white mystic slate. That led Reeva to next next question, what were they planning to use this for? But, as soon as that question came to mind, he could already see the answer.
Control over other mystics.
If this project is ever complete, white slate slate could be turned into anything. A sword, an arrow, or even worse a bullet. Reeva could imagine the power the church would have when they could disable the opposing mystic in a second.
Just one bullet and all the mystic power would be turned into this white mystic force. The thought of it sent a shiver down Reeva's spine. Especially when he already sees the consequence of such action.
