If the aliens are after conductive metals, why aren't they touching the various metal objects around? Lampposts, downed airplanes, cars, etc. The entire city is untouched except where the aliens are drilling for metal.
Also, it is stated that glass panes and Faraday cages (somehow) render humans invisible to the aliens. So couldn't a lot of the plot (and a lot of death) been averted by doing the sensible thing and move around in cars?note Presumably the aliens can "see" if a car's electronic components are operating or not.
If the aliens are blind to visible light, as demonstrated by their inability to see through glass, how'd they come up with their invisibility-effect in the first place?
It's possible the aliens are unable to see with their shields in place (the same way that humans wouldn't be able to see while invisible due to light not being able to reach your eyes) so the electrolocation is a workaround to that problem.
Also, why are characters who know the aliens can't see through glass, hence aren't using visible light, still so reluctant to cross the city in daylight? Moving at night gives the humans no protection and puts their own primary sense at a severe disadvantage.
They started doing that because they would be more able to see the streetlights and such turned on by aliens, not to better hide from them.
If electronics have been "fried" by the aliens, why do they work when the aliens get near?
