OBF on E225 you can fly 3 Axis (why though) and the V/S or ALT will be alone on the cyclic longitudinal channel, but only when the IAS is above 65 KIAS.
However if you do not have enough power such that speed decays, the DAFCS automatically engages the 4th axis (collective), and the helicopter is remains in the safe flight envelope.
The EC225 DAFCS is a complex beast to explain on paper BUT utterly instinctive to use AND in its behaviour. In essence, whatever you try to do, it will respond to safely recover the Attitude, IAS and ALT.
Passengers and non EC225 pilots. We, the lucky ones on the EC225 cannot overstate the massive leap forward in safety the EC225 and EC175 represent. The L2 is Great ship, lacking only in the protections that are built into the modern DAFCS.
DB