The nature of Patronuses (Patroni?)

[potioncat]

No: HPFGUIDX 152067

 
> Ceridwen, 
> 
> I thought he was being snide to her, since she doesn't like her given 
> name.  This is a way to get at Tonks.  But it shows that he does know 
> her outside of class, since he can make that sort of dig.


Potioncat:
DD also calls her by her given name. 

No, I don't think Snape is doing it as a dig...unless there's sort of 
jealousy going on here...I think he's used to calling her by name. So 
far the only other people we've seen him address by given name is 
Draco, Igor, Narcissa and Bellatrix. (uses her full name too.)I think 
he also refers to Lucius by name, but I could be wrong.

He would have taught her, but you'd think he'd call her Miss Tonks if 
that was the extent of it. She could have been in his House. Her House 
was very carefully avoided when she talked about her school days in 
OoP. Or perhaps Severus also knew Andromeda well. 

Which brings up the fact that no one is the right age for the 
generations to happen the way they do.