Where the fan goes after something like a fan shaft separation is pretty much indeterminate. Initially the thrust vector will pull it forward, but then it will immediately start chewing into the inlet and surrounding structure - and that will start to re-direct the fan depending on the nature and density of whatever structure it's impacting.
As I noted earlier, the only comparable event I can think of was an RB211 on an L1011 center engine back around 1980. IIRC there was some sort of bearing problem that caused the bearing to overheat to the point the lube oil caught fire and cut the shaft - the fan went forward and down and tried to cut the aircraft in half
. Although they managed to land safely, it was an obvious safety concern and Rolls came out with a 'fan catcher' (sort of a disc brake like device) that would retain the fan in the event of a future shaft failure. A while later there was a similar RB211 fan shaft failure but on a 747 - the fan catcher worked, but the LP turbine quickly over sped and burst, cutting the back of the engine off and peppering the wing and fuselage with shrapnel...
