Assassin's Creed Revelations Walkthrough Part 30 – The New Regime

You have some free time in the game here. Take a moment to ensure you have your armor upgraded for  the next Segment. For now though head back to the Assassin's Headquarters. Go to the study and interact with the disc.

You are once again Altair. You are walking and talking with Maria about Abbas. It leads you into the courtyard behind the Assassin's Headquarter in Masyaf. You learn a good bit about what has happened, as Altair is now 63. Once Altair confronts Abbas, who offers knowledge in exchange for the Apple of Eden, you will find yourself fighting through a wave of Assassins. They all have swords so nothing hard, you can run away or simply fight, disarming or kill streaking. It is not hard. Head for the main building, a second wave of assassins appear. Deal with them however you desire. Now head inside the building and go up. Go through the window and make a dash for the window. From there, head for the next waypoint marker in the village.

This section is best handled as Darim suggest, with throwing knives. You now need to make your way through the village, killing assassins all the way. All you need to do is make sure both Altair and his son make it out alive. Once you do, you will have completed that memory segment.