As Henry's free throw swished through the net on the front end of a one-and-one, Richmond's Derrick Williams and the 49ers' Willie Clayton became entangled setting up for a potential rebound.
Back came the hosts and they came close to an equaliser soon after the interval as Samba nodded on a long throw and would have found the net had it not been for the well-positioned substitute Yuri Zhirkov, who cleared the danger from the line.