[If Douman were a cat Fandaniel would be treated to some extra-angry tail lashes.]

Because I am holding back! [is he really?]

I'm used to exorcising oni and hordes of maneating monsters, or maybe a well-hidden curse cast on a high-ranking noble or general in order to turn the tides of a war campaign! Having to deal with vermin in the middle of a living district is like asing a tiger to catch you a bug inside your house without breaking anything.

[Note that he didn't say that he isn't needing help dealing with that thing.]