As soon as he's been let go, Steven is making a dash for the best - but the spell catches him before he can make it there. His shadow freezes, and at the same time Steven's body is frozen to match. He strains against it as hard as he can, but all that comes of it is him making desperate sounds of fear and exertion, his body suddenly becoming its own form of a prison.

The spell doesn't stop him from continuing to cry, of course. He gasps in utter terror, the tears continuing to roll regardless. He can still see the cellphone laying across the room from him, but he can't move, he can't do anything - he's helpless.