Why is Tonks clumsy?

[vidar_fe]

No: HPFGUIDX 111730

vidar_fe:
> If Tonk just changes the general shape of her body, could that 
> possibly be enough to put her off balance? Let's say, for instance,
> a significant increase / decrease of weight?
> 
> Look out for the fat lady! :-)

Tonks here:
> Ok folks, I couldn't let this one pass now could I?  I am a little 
> off balance because I am not using my cane.  (Some of you will know 
> what I mean.)  And who are you calling a fat lady!! 


vidar_fe:
Sorry, didn´t mean to offend you! *Begs forgivnes*
I was not talking about your real self there. Only the form you use
when you spy for the order, when you need to be unrecognizable.
So, no hard feelings, right? ;-)