Why would Rihanna be shook by Beyonce's album? The ICON her career is in good shape right now.
Besides, Beyonce always sells better than Rihanna. This is nothing new or shocking. It's not like Rih was the album seller of the bunch before. I doubt Rih would be surprised or upset about Bey's success. 4 with its 2 flop lead singles sold 310k first week, Loud with its 2 #1 hit singles sold 198k first week.