Derek was motivated to encourage Allison to stay as long as possible, and earn her trust, so he decided to dismiss her question about how long before the terrain would allow her to leave with a shrug, and focus on her fixation with the bag and his training.
"Just because we have teeth, claws, fast reflexes, and strength beyond a human doesn't mean we don't need to be trained how to use them. Our family has always held the opposite opinion, actually. That since our abilities often far exceed those around us, we need to be aware of our capabilities, and learn self-control from an early age." He shrugged again. "You're an Argent. I can't imagine you weren't taught self-defense since you were large enough to hold a weapon."