Is this the mission where you have to take on a few waves of HE-111's? God, that mission did my head in... must have spent an hour chasing the 109's around the map, waiting for them to turn so I could try and hit them..
Anyway, the fireballs are caused by the Heinkel's randomly exploding.... it seems to happen when the next wave of Heinkel's is about to appear...if any of the previous wave are still in the air, they blow up. Its probably to clear system resources or something.
Or it could be aliens.
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