The opposite happened to me while ago. I was crossing PP (alsius bridge), and on the other side a little ways was a lvl 50 (i think) conjurer. This is really late at night, so not many people are on. So I bow to him, and start to walk away. But he starts buffing himself and chases me. So I was forced to kill him
Luckily I froze him while he was casting his iron skin, so that was wasted.
I forget his name though, definitely not english.