Once again the glasses guy survives -.- cant he just die already
It's probably because the girl is held within the partial death state, or something. He probably wont' die as long as she can be saved by the MC's thing, which could also probably heal her, but for now the plot is centered elsewhere. Not to mention that she will probably be used at some point as a trump card to stop NAD.
A real Colossal Sword, is only Colossal when it is at least 5 times bigger than the thing you pilot: