At the first sign of trouble, the citadel's gates will close. Should this happen, the only way for me to escape will be to climb the fortress walls.
Altaïr approached the informant.
- Informant: Oh God, don't kill me! Oh, it's you Altaïr. You scared me. Richard's men are after me, two of them to be exact. I was trying to strike a deal with them, but I realized that they were toying with me, so I ran away. You shall be the angel of death, and collect their heads before they collect mine. When it is done, I shall tell you of the deal.
Altaïr assassinated all the targets and returned to the informant.
- Informant: What a relief it is to know that I am safe! Thank you, Master. I... tried to make a deal with the citadel guards to leave the gates open, even when the alarm sounds. I failed you. So now your only escape from Richard's citadel, will be to climb the fortress walls. Forgive me.
Altaïr learned that if the citadel's gates closed, climbing the walls was the only way of escaping.