Ann: Final Assays & Structural Report Confirm Mawson Discovery, page-35

The difference with Nova though is that it had a 1000m long, strong conductor that turned out to be nickelifferous massive sulphides. Legend do not have that which suggests that either the massive sulphide orebody is at a significant depth below the current drilling, or that there just isn't a large enough body of massive sulphides there to detect.
They would have completed down-hole EM on these holes and the fact that they haven't announced a booming off-hole conductor is a little concerning.

This looks very similar their Octagonal mineralisation. The systems are there, there just needs to be a place where the massive sulphides have accumulated.

Bas.