It happens occasionally. I chased a ball ONCE my first year at a camp. Let's just say that the evaluator disuaded me from doing that again!!
In games with running clocks and a player just shagged a loose ball, I feel it is IMPERATIVE to make sure that there are 5 players from each team on the floor, there are no subs waiting at the table, my partner/s are ready and have no information to give me, remind the player whether it is a 'spot' throw in or they can run and making sure the defender does not reach over plane before I take one last look around before handing the ball to the player to put in play. I just LOVE running clocks!!