First off, the scyllia in your screen is number 78 in activity.
[M]-Golden.Druid 00:15:27 31/01/2013 06:24:24
Thus an encounter with it is rather rare and actually is an exceptional case.
As for last night, there was a report of a Corsair in system, was given as a probable cruiser. That ship was logged for a good cap fight. The pilot was actually griping in group chat about logging for a cap fight and ending up with a titan instead.
By logs of the encounter, you were given opportunity to leave which you chose not to do. You were then engaged and the dessie stayed out of it. You chose to put fire on the unarmed and unarmored mining ship, which is perfectly fine. The dessie then got between you and the mining ship and forced you out of the immediate area.
Dublin is our home, our primary system. If a Molly merc goes to gamma we end up with multiple corsairs from snubs to legates logging in to shoot us. You had 2 ships, of which only one gave serious combat to you.