You later learned Sheriff Bob, working with Marlin, Noor, and Prim (and the Alpha Omega, Sarrah), were working on how to stop Arthur, save Colbey's body double, but make Arthur think he'd succeeded.

I don't think what happened (Arthur breaking through to the City) was what anyone there expected.

Definitely not Bob, who is shitting his pants wondering if Peter's going to out him in front of Arthur.