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When Q5 turns off, sharply, the flow of current through L1 and Q5 is interrupted and you get a sort of 'water hammer' effect, except with electric current rather than water.
Duffy says that Q1 and Q2 are a Darlington pair, but I'm not so sure. If Q1 turns on, then Q2 would tend to turn off.
IDoes this mean your red and black tracings on the bottom of the board should be reversed for red power/black ground?
Sounds to me like Q1 and Q2 do the pulsing or reversing but if you guys can't decide how they work, how do think I feel?