User blog comment:Gearslover01/Why did we search through Altair in ACI (Spoiler for Revelations)/@comment-4636255-20120809233545

!!!!SPOILER ALERT!!!!!

They were looking for Desmond for Ezio's memories. But then the DIA satellite incident blew up their Piece of Eden, and they needed a replacement so as to stay on track and launch te mind-control satellite by December 21. So they first made Desmond relive Altaïr's memories. They realised that he had began to suffer from the bleeding effect, and so he made Lucy take him to the Hideout. A place where he would feel safe, and willingly explore Ezio's memories, making the job easier (an unwilling Desmond took 7 days to finish 2 months of Altaïr's life, but the same Desmond willingly finished 23 years of Ezio's life in 2 days).