BBB - The Blenheim Bomb Bug

I should post a video here (a screenshot won't show it) but there's a small funny thing going on when the Blenheim drops its bomb.

It rather seems as if they jumped out of the bomb bay in the same manner the heck gunner would if he had to hit the silk.

That is the bombs (at least the last two) make a small jump upwards before falling down. They definitely just don't drop out of the bomb bay.