Gen 1 line
I disagree with the fact that Gen 2 will stay online and supply the rest of the network.
By pressing the Gen 1 line pushbutton, it will force the electrical system in EMER ELEC CONFIG therefore AC1 and AC2 will remain disconnected
GEN2 will not takeover and GEN 2 will go offline
The only difference between Emer elec and smoke config is that fuel pumps 1 are supplied.
Please review FCOM Elec schematic and check that gen 2 is disconnected as well.
The purpose of GEN 1 line is to keep pump 1 of wing tanks connected.
If you had to shed the electrical system manually , firstly it will take too long , secondly you will end up in gravity fuel feeding.
Smart airbus