It is hard to tell if the dispenser is receiving power from 2 blocks above, or if it is being triggered by the moving block. But when running power 2 blocks above into a (sticky) piston that moves a block down next to an unpowered dispenser the dispenser fires. Hows that for a run-on...
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Both. It's being powered by the redstone two blocks above it, and the block coming down next to it is updating it so that it recognizes that it's powered, and therefore fires.
what you are seeing is quazi connections. the redstone dust powers the dispenser but it will only fire when it has received a block update such as the piston pushing the block next to it.
WAI. MC-108