Re: That's a Graflex, right (Force Awakens teaser trailer #2)?
I'd think this is much more likely than remotely activating the blade. They could be recording gyro and accelerometer data for motion capture reasons. They'll have to rotoscope the blade in post anyway, even if it's an FX blade, and that data would make it much easier.
Now that people are noticing it, I wouldn't be surprised if this is one of the many touchups that they do to the movie before release - if the antenna is ever clearly visible in frame (rather than something like this dark, quick shot that fans have overanalyzed), it will probably be painted out later.
They could be gathering angle, speed, etc. data for sound dubbing in post. A method like that could even allow the process to be automated with a computer program.
I'd think this is much more likely than remotely activating the blade. They could be recording gyro and accelerometer data for motion capture reasons. They'll have to rotoscope the blade in post anyway, even if it's an FX blade, and that data would make it much easier.
Now that people are noticing it, I wouldn't be surprised if this is one of the many touchups that they do to the movie before release - if the antenna is ever clearly visible in frame (rather than something like this dark, quick shot that fans have overanalyzed), it will probably be painted out later.