Polyphemus screamed as loud as can be. He ran around in circles around his cave. Polyphemus called out for help from the other Cyclopes, but he said "NoMan" hurt him, so the other Cyclopes thought that he was ok. They didn't think anyone was attacking him because he said 'no man' hurt him.
Polyphemus was exhausted from all the screaming and fell asleep. Odysseus and his men still needed to escape from the cave. When Polyphemus moved the boulder to let his sheep out, Odysseus had an idea. Since Polyphemus couldn't see he touched the sheep that left the cave to make sure the sheep were the only things leaving the cave. So, Odysseus and his men tied themselves to the bottom of the sheep and escaped.