That remains to be seen. They must emit a heat signature like a searchlight, and their maneuverability is severely limited by their speed simply as a function of momentum.
True, but if something is traveling at X, you have to be able
to shoot off something from behind at X+ (whatever) to catch
it, and X+ (plenty) to do so in time. As for if it is headed
in, you’d have to have some sort of pretty amazing tracking
to fire off effectively. If it’s at low level, good luck
with that.
It would be a challenge.
I agree with your thoughts on it as per heat signature, quick
evasive moves, and momentum.