Nicollette Sheridan’s manipulative Alexis Carrington is departing from Dynasty, with Friday’s show marking her farewell from The CW’s drama. But the goodbye was anything but quiet, as one might expect from the deliciously wicked Alexis. After reuniting with her long-lost son, Adam, there was a complication in their new relationship and an unexpected twist. *** SPOILER ALERT: Do not read further if you have not seen the Friday night episode *** The joy of the reunion with…