Parachutes

Peter was right, and we were successful in our attempt to cut them off. But first, we went to the villagers for supplies. They weren't much like villagers in my book, though. They had laboratories and stashes of just about everything you could need for war, including parachutes. I reprogrammed my time machine so that it needed altitude as well as longitude and latitude. The rest is predictable. We cut off Bob's army before they reached the village, and then went through the portal. What was on the other side was air, the ground two thousand feet below. We were the only mortals to survive as the rest plummeted to their deaths. But Bob soon recovered and so the chase was once again on. This time, however, I had yet another idea.