"How's this possible?"
The Necromancer was in shock.
A second ago, Grey was within his grasp, within the next second, Grey not only escaped his grasp, but turned the entire situation on its head. At the moment, the Necromancer was no longer able to use his elemental essence which isn't supposed to happen, unless he has lost all ability to use elemental essence.
Grey is only in the First stage of the Sovereign Plane, there was no way he would be able to achieve something like this. Only someone on the same stage as the Necromancer could achieve something like this, at least to the knowledge of the man.
What he didn't know was that Grey used the help of cutting off his link to the puppet and his speed to get the better of the Necromancer.
The Necromancer soon realized what happened and looked at Grey in fear.
"Impossible! You're in the God's tomb." The Necromancer couldn't accept this.