Bobby had flown off the cross to chase after a Cooper's Hawk for a few seconds.
The Cooper's Hawk moved to the other side of the park where it flew amongst Starlings and pigeons:
The Cooper's Hawk dipped down low at the eastern side of the park.
Here it is as it made its descent, pigeons scattering around it:
Bobby, back on the cross:
He tried to grab onto the lintel below the terrace but lost his grip: