Riverbed (RVBD -16.8%) plummets as the Street gives a thumbs-down to its deal (I, II) to acquire Opnet (OPNT-OLD +29.6%). Also hurting is a downgrade to Underperform from Jefferies: the firm notes Riverbed is paying 30x estimated 2013 EPS (ex. cash and interest income) for Opnet, and sees the deal as evidence the company's core WAN Optimization hardware market is slowing down.