Concours, losing a fan blade will invariable cause a surge (go look at the videos of fan blade out testing a few pages back).
Cause and effect is 99.99% that the surge was a result of the blade release, not the other way around...
Also, healthy CFM56 engines very seldom surge. Oh, and the number 2 engine on the DC-10 was notorious for surging during climb - flow distortion from the fuselage at higher angles of attack.