Lately Core has been known to do nasty things inside the NFZ, especially to the Freeport and it's defenders. Hagbard has also felt the effect of such, being the initial victim of that ominous encounter in which later the Persephone nullified one of Core's ships for example. What did you expect? And then you can't really say Delta is so small there isn't much room left for Core outside the NFZ. Sure he was threatening, but defensively, not offensively unlike how Core tends to roll.
Also, complaints about TAZ behavior could just as well end up in the TAZ feedback thread, I guess there is one. This one is for Core as far as I know.