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Puff of smoke from #1 engine seconds before gaining altitude....
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That flash is the anti collision light, it's presumably mounted on the engine exhaust of the Greek apaches. The combination of strobe duration, shutter speed, and frame rate only catches some of the strobe flashes. Watch random aviation videos on YouTube and you'll often see erratic strobe flashes due to this.
No military copter pilot in the world would fly like that with a face full of warning lights. Also that aircraft would easily have had enough single engine power to continue level flight.
Lastly the cone angle on the rotor as he descends toward the water is way higher than you can get with single engine power at normal rotor speed.
I hate to make assumptions, but all evidence in that video is that he was almost certainly attempting to show off.
Does anybody know if the Greeks have GE or RR engines?