¡°Ron, how can you let him go with you? After what Sirius Black nearly did to you! I mean it, I'll tell ¡ª¡±
¡°Yes, Yes, I will,¡± said Lupin.
A paralyzing terror filled Harry so that he couldn't move or speak. His Patronus flickered and died.
¡°Everyone gather ¡®round,¡± said Snape, his black eyes glittering, ¡°and watch what happens to Longbottom's toad. If he has managed to produce a Shrinking Solution, it will shrink to a tadpole. If, as I don't doubt, he has done it wrong, his toad is likely to be poisoned.¡±