Talk about disproportionate retribution. [He says as if he wouldn't be just as angry if their roles had been reversed.] But my, a toxicologist! I always did think that was one of the more fun fields to study.
[That isn't to say he's an expert himself, just that he understands humans that gravitate towards it. Poisons aren't a serious threat to members of Puck's race, but there's no need to outright say that - especially since there is a chance that poisons in this world work differently from those in Puck's world.]