When Swat gets to the scene it is nighttime. When they throw the grappling hook up to the roof, however, you see the clear blue sky of daylight.
Luca would not have remained on duty after the man was shot. He would have been suspended while the investigation by Internal Affairs was underway. This is standard procedure when any police officer is involved in a shooting. The officer involved would be relieved of their gun, and most probably their badge, until they are cleared.