Answer:
He removes Scarlet Pimpernel's disguise and appears to Chauvelin as Lord Percy and invites him to smoke snuff.
Step-by-step explanation:
This question is about the book "The Scarlet Pimpernel" that tells the story of how Lord Percy disguises himself in the hero Scarlet Pimpernel to save French nobles sentenced to death by guillotine.
Scarlet Pimpernel has many enemies who do not like to have their activities interrupted by him. One of these enemies is Chauvelin who sets a trap through which Scarlet Pimpernel would not be able to escape. However, in order not to be found, Scarlet pimpenel removes all disguise and appears to Chauvelin as Lord Percy and invites him to smoke snuff. Chauvelin accepts the invitation, but Percy mixes the snuff with pepper powder which causes Chauvelin to have a series of sneezes that leaves him unable to chase Percy.