The realization struck Jack moments before the foot did. People feared giants for the wrong reasons. Cruelty drove the towering creatures no more the average human, and less than most. Attracting their attention meant a person may be studied for a few terrifying moments, but almost always released unharmed.
No, Jack thought as he stared at the thirty feet of foot coming down towards him, there was far more to fear from the obliviousness of powerful beings.