Hermione (as Mafalda Hopkirk): "Oh dear! Perhaps you’d better take the day off!"
Reginald: "No – no! I must – today – must go – "
Hermione (as Mafalda Hopkirk): "But that’s just silly! You can’t go to work in this state – I think you ought to go to St. Mungo’s and get them to sort you out... You simply can’t go to work like this!"
Ron (far right) disguised as Reginald Cattermole with Hermione and Harry (also disguised as Ministry workers)
"You realise that I am on my way downstairs to interrogate your wife, Cattermole? In fact, I’m quite surprised you’re not down there holding her hand while she waits. Already given her up as a bad job, have you? Probably wise. Be sure and marry a pure-blood next time... But if my wife were accused of being a Mudblood — not that any woman I married would ever be mistaken for such filth — and the Head of Department of Magical Law Enforcement needed a job doing, I would make it my priority to do this job, Cattermole. Do you understand me?"
She gave him a Puking Pastille, and when he started to vomit, she took some of his hair. Reginald still tried hard to get into the Ministry, desperate to be by his wife's side, despite repeatedly vomiting and being unable to walk straight, but Hermione advised him to go to St. Mungo's. After being unable to stand any longer, he finally Disapparated.
Reginald (Ron in disguise with Polyjuice Potion) exiting the lift to deal with the raining in Yaxley's office
This was all part of Hermione Granger, Harry Potter, and Ron Weasley's plan to access the Ministry undercover. Hermione transformed into Mafalda Hopkirk, Ron used Reginald's hair and Polyjuice Potion to take on his form, and after Harry took on the form of Albert Runcorn, the three headed into the Ministry.
Reginald returned to the Ministry, pale but no longer ill, just in time to witness Ron, Harry, and Hermione assisting in the escape of Muggle-borns who had been detained by the Muggle-Born Registration Commission, including his wife. Harry advised them to take their children and leave the country while Lord Voldemort was still in power.[1]
Later life
It is unknown if Reginald and Mary took Harry's advice, or what happened to them after the Second Wizarding War ended. However, Ron was dubious they escaped as he got the impression Reginald was not quick-witted when he impersonated him.
Physical description
Reginald was described as being a small, "ferretty" individual[1].
In the Deathly Hallows Part 1 film his physical appearance differs to that of the book. The book says that he is small and ferretty whereas in the movie he is rather tall (taller than even Albert Runcorn).
Cattermole only appeared three times as himself: once during Pius Thicknesse's speech, once lying on the floor unconscious after the trio stun him, and once when he shows up as the trio's leaving the Ministry.
Etymology
"Reginald" is from Reginaldus, which is a Latinized form of Reynold.
