FLIR works even better if you have any kind of light at all.
Just so I understand your point, you're not saying FLIR works better when it's light out, right? You're saying it works well to find a flashlight, I presume. That hot little incandescent filament is going to be a lot hotter than body temp. I suppose even a lit tea candle would be helpful.
That sounds crazy that a lowly MiniMag could be picked up 20 miles away by that pilot!