Would one of these coyotes ever attack a person walking through? Best defense if so? Other than a firearm.
My opinion - unless you're a small dog or a child, its very very unlikely. Coyotes have been present and prolific for a long time now and attacks on adults are all but nonexistent. That having been said - the coyote/wolf mix does hold some mystery behaviorally because the possibility exists that they may have a mix of behaviors or behave like neither. Eastern coyotes represent an emerging species, and until its fully "emerged" and rigorously studied - nobody can really be sure.
What you can be sure of is this: wild animals don't start fights they can't win unless forced. That's where your defense comes in. The best way to put it - don't make yourself look like an easy meal or a threat. Be calm . . . "excuse" yourself from an unwanted encounter but never EVER run. Ever. If a coywolf (or any predator in NJ, really . . .) gets too bold, you should respond with boldness, but not viciousness.
Let them know you aren't weak, but also that they don't have to defend (pups) against you.
Because of my job (and extracurricular responsibilities) I spend an absurd amount of time in the woods. I've seen coyotes time after time - even had one trot by me within 10 feet or so - but not once have I ever felt threatened.
Confidence and calmness are your best defenses against coyotes, but its basically moot. Your time would be better spent learning how to defend against falling trees, quaking bogs, or lightning - one of those things will try to take a piece of you long before one of the scraggly pine-wolves do.