Leave it bent over, the plant will react by forcing more nutrients to the upper part of the plant. This will be the best yeild you have gotten yet. A snap means you went a little too low, don't worry and I wouldn't splint it if I were you "what doesn't kill us makes us stronger" especially true for marijuana. I did 1 grow breaking all the plants and yeilded 5oz. per plant in 45 days. I did another without breaking and only yeilded 3-3.5 oz. per plant. And the second grow didn't have as dense of buds as the first.