That line could also be lens flare diffraction or an aircraft's contrail ,Even just the wires and cables; considering the object is descending toward the ground, the shooting angle of PR38 appears to be an upward-looking shot
I agree the longer straight line looks like a possible contrail. Though could be something else. If the background is the cold sky I'd expect a contrail to be darker, not lighter than it, in black-hot. I also was thinking about the viewing angle being either at a steeper downward or upwards angle because it may better fit the parachute possibility. But the shallow "5" angle here is problematic for that theory of the viewing angle being steep. I think typically that would be the elevation angle relative to horizontal, not relative to the vertical axis.
Also it could be hostile action by IRAN shooting a laser into the optics in an attempt to damage it.
The idea of it being an infrared laser is also interesting. Either in a test/calibration/training setting, or an actual laser countermeasure being used against the aircraft.
Here is a video and some photos of me pointing my cheap little infrared camera at the sun (bonus: a few birds too). There are some spiky artifacts and a very large glare/bloom, but the diffraction spikes are not to this extent. That will all come down to calibration and other camera factors.
When I move the camera around there is a ghosting trail behind the center of the sun that fades with time (and gets wiped out when the camera shuts the shutter and recalibrates every 30 seconds). This is black hot.
What's maybe more interesting and relevant to this thread is that when I record a video like this which shows a ghost trail behind the sun motion and then point the camera away from the sun in order to get a more reasonable contrast background than the sun and cold sky, parts of the trail actually look very white (cold). This stuck out to me because the sun is very hot and I would assume the trail left by it would also persist only very "hot" values in the pixels. But below, parts of the trail actually look like they're the maximally white pixels in frame.
While there's a sun trail artifact still present, pointing the camera at the window of my car:
Pointing it at the plastic on the inside of my car door:
I think my main takeaway is that the 'smoke trail' in the chandelier video is probably a pixel saturation / ghosting artifact, and my other takeaway is that the way infrared cameras work is very non-intuitive and can produce weird imagery.