The exact same way that Bowie became friends with Allison, and a spy for the Moot, and friends with that Lurian guy (what was his name, Tjsasa?) and secretly plotting to eradicate Astromancry from Swordfell. Don't you see? Sevastian can see into parallel universes! He knows things that aren't even true. It is rather amazing if you ask me. I'm impressed.
To be fair, Bowie
has been collaborating with Machiavel. To the point that it almost single-handedly drives D'Hara's foreign policy. Lots of characters know that. However, the idea that anyone in Luria is friends with Bowie, or vice versa, is ludicrous and should discredit Sevastian's entire statement.
