Is the SEE INVISIBLE intrinsic gained from quaffing from a fountain permanent

A special spell has a higher rate of successful casting. Each role has one special spell. These are listed in this table.

I haven't tested this, but i found this in Nethackwiki: http://nethackwiki.com/wiki/Watchman

Pacifying all hostile shopkeepers by paying them off also pacifies any angry watchmen on the level, so you can pacify all the watchpeople in mine town by stealing something inexpensive (a gold piece) from a shop and paying for it when the angry shopkeeper comes after you.

Usually when i get hallucinated in such places I try not to attack anything, unless it hits me first, because then it's no Watchman or Pet. Coming back later letting your Pet kill the Watchmen is also an option. As far as I know, every kind of crime is treated the same way.