There are proposals coming along (RFCs) that will explain this part much more clearly. There is need for segmented networks to perform certain things. safecoin will not be farmed (as the difficulty rate change will catch a segmentation). It’s possible for the smaller network to store data and through negotiation upload it, just not safecoin (network controlled).
Otherwise all sorts of crazies will try daft things to get money for nothing as dire staits would say
There is a natural protection for safecoin as the person you may try to buy it from is on other network etc. I will go very deep into this soon enough. Needless to say farming your own on your mini network won’t work :-). There is also the possibility of burned safecoins merging as they use cryptographic proof of burn (Delete request for signed / owned data) and not group consensus. It becomes a different thing al together.