Before revision:  In this case, for p_c<p < 1, the center of mass of the  prey and predator fronts travel at the same speed and the two fronts fluctuate, but remain close to each other. We find that the speed of the pinned Chase-Escape front is strictly smaller than the speed of the Eden front when its spreading rate is equal to p and show that it is caused by the prey sites at the leading edge being eaten up by the predator.
After revision:  In this case, for p_c<p < 1, the center of mass of the prey and predator fronts travel at the same speed . This speed is strictly smaller than the speed of the Eden front when its spreading rate is equal to p and show that it is caused by the prey sites at the leading edge being eaten up by the predator.