He's not being held there, he can leave whenever he wants. Maybe visiting hours are just ending or something, and the next day Isra is just gone.

Though... how does that leave the teams?
Willow-Ame
Monado-Lupus
Timothy-Lilith
And there's Franklin, Russet, Abby, and The Espurr With No Name. Who should be going with who?

Also, I'm a bit confused about what to do now. So now Timothy is going to help Lilith out with the book?