This Anon has noticed that we've had a prompt with Altair being a courtesan... but not one where he's the owner of a brothel. (Like Claudia)
So, the little idea that came to mind was this:
After Masyaf is attacked the assassin's probably need information as to how they got in.
What better way then to ask someone that people spill their guts to while having sex? (No, not their wives... because I doubt the Templars would bring them...)
That's right, Courtesans.
So, the assassins try to get the information from the ones in the city. But every one of them to go to Altair. (but who says they say his actual name?)
Eventually, the assassins have no choice but to go and get the information.
But the brothel is getting attacked by guards when they get there, so they decide to save the day.
Only thing wrong is that when they burst through all the guards are dead, the courtesans are cleaning up, and Altair is flipping a knife (because an Altair who doesn't kick ass isn't Altair at all.) and drinking ... tea...(I don't know...)
Insert shocked assassins here.
After the shock, the assassin's try to persuade Altair to give up the information. However, it doesn't work too well. So, they instead have a pissed of Altair in front of them...
If Altair helps or not is up to the writer!anon (If this gets one) so... yeah...

I'm gonna hide now... >.>