Attack by books, definitely unexpected. Charles would be congratulating him on his ingenuity if the situation weren't so dire.
The illusion was crumbling around the edges, Charles could sense it. Someone was trying to keep it going but trying to keep multiple fake people going was taxing their concentration. The students were just figures now, no longer individuals as they tried to get past the books to Erik.
Pull it all down, Erik, don't stop... Hoping that this would be effective in the real world. There was a rattling of metal outside this reality. It was working....