Original sentence: He is accompanying Kira, but Birdy leaves later on for an unknown reason.In Episode 46 of Gundam SEED Destiny, Birdy is the reason why Athrun spotted the hidden assassin Sarah.In Gundam SEED Destiny, Birdy is portrayed as a figure who alerts Kira & Athrun's presence to each other as seen in the ending of Episode 51.The first time Birdy is seen in the series, it is with Kira at the college he attends in Gundam SEED
Edited sentence: He is accompanying Kira, but Birdy later leaves for an unknown reason.In Episode 46 of Gundam SEED Destiny, Birdy alerts Athrun to the hidden assassin Sarah.In Gundam SEED Destiny, Birdy alerts Kira & Athrun's presence to each other as seen in the ending of Episode 51.The first time Birdy is seen in the series, it is with Kira at the college he is attending in Gundam SEED