So he's sold some Cisco shares at $24 a pop, yet bought another load of shares at $17 a pop. If you could make a 40% profit, wouldn't you?
I accept his total number of shares has shrunk, but maybe he's looking towards his retirement and wants to liquidate his assets? After all, if you have a large number of shares, selling them slowly is a much better way than dumping the lot in one go.