I think it is an extra boost but also the sudden increase of heat signature might blind the IR guided part of the interceptor.I wonder what this missile is doing when it flashes twice before impact,
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I've seen this in other videos but only one flash. Something to do with terminal boosting?
I wonder if they figured out approx what altitude they will be intercepted to time the two boosts from the 12 Day War. I wouldn't be surprised that besides the footage we see online, Iran would have spies recording the interceptions to give useful data to Iran to adjust their missiles.

