He manipulated the giant hand, which showed numerous complicated runes. These runes from the giant hand penetrated into the phantom doppelganger's body.
Only then did he release the giant hand, leaving the phantom doppelganger suspended in place, losing control of its body.
In fact, even if he did nothing, the strength of the phantom doppelganger would have no impact on him.
No matter how weak, a half-step Great Power is still a half-step Great Power, and within his Grotto Heaven, he is a god, a god who controls everything.
The phantom doppelganger is within the Grotto Heaven, and with just a thought, he can control it.
"Su Tong is truly useless!" Having done all this, the half-step Great Power Lian Lei muttered to himself angrily.
In his mind, being trapped here was entirely due to Master Su Tong.
