IMO, the part I highlighted would be a very ggressive skier. Even to the point of insanity. In order to ski trees that aggressively, you have to be able to ski defensibly; quite well too.
It's the difference between driving aggressively on the autoban or Boston rush hour traffic. In the latter you can be aggressive, but in order to survive, you have to drive defensibly and you won't go far without hitting your brakes.
Insanity for some is normalcy others. Offensively, defensibly? how about just loving it...