OK...I know there were more important and better plays, but.......note how Ed Dickson put both arms around the 49er he was 'blocking' and did the ultimate hug and hold. It helped a few more precious seconds elapse. A penalty in the end zone for a safety did not matter, since that was the desired outcome of the call.
It's the little things at the crucial moments that the Ravens do better than most.
It's also rather odd that one of the most blatant, intentional, designed holds I have seen....didn't draw a flag.