A dynamic rope is specially designed for climbing, as it can stretch to a certain percentage of it's length, as to absorb shock. These ropes are relatively fragile, as they consider of a center core of fiber, surrounded by a woven sheaf. Stepping on a rope can potentially bruise the rope, which is not good. Climbers are very protective about their ropes (for obvious reasons, in addition to the fact that they are expensive), and the tradition is that if you step on somebodys rope, you owe them a six pack. this is ruthlessly enforced in some areas.