There were two occasions in the UK where an accidental EC135 SAS/Autopilot disengage occured with not entirely different results. As the SAS EHA is de-powered the SAS control piston returns to its neutral position and although this is supposed to be damped, the effects can be dramatic - in both cases a significant flare and right roll occured leading both pilots thinking (if memory serves) they had encountered a double engine failure (possibly due to seeing the wrong end of the needles in an 'unusual' position. One rolled over on landing whilst the other was rather more lucky.
Just a thought.
TeeS