For the SLFs here asking about " electronic protection" : helicopters are not required to carry TCAS and in any case TCAS RAs are disabled at those altitudes.
Thus showing you the calibre of the most of the posters above you!
Am surprised this thread is still here.
As SAS says:
A crew in an IFR aircraft fortunately catches sight of a far smaller one and takes action promptly.
No heroics or superpowers involved with this - just luck.