Question

Plz explain;come on i yelled but sebastian was sitting as if his body had been turned to stone.... Virtually True

Answer 1

This means that the body of Sebastian turned to stone because his brain got captured in the game and without his brain he could not move.

Answer 2

The sentence contains Idiom.

I(the speaker) shouted(yelled),but the person named Sebastin near him was just sitting as such as nothing is happening.

-WonderGirl