Strange, I haven't noticed any of the 'typical' black pine behaviours. I recently picked up my male 2 weeks ago, and he has never had any inclination to bite, or even hiss at me. I don't have any adult pics as my little guy is less than a year old, he only measures about 37cm long. Yet he is already very active, and likes to rearrange his substrate (I use coconut fibre).
For some pics of adults I suggest the site:
Third Eye Pine Snake Page
I named my male 'Luther'...my black pine is a thrill to take care of, good luck with yours.