The BP has more effect on the micro organisms, which in turn have an affect on the bait fish and then of course the fish. Quick changes in pressure lead to instability in the water column, making it difficult for a micro organism swim... And in turn makes them sitting ducks for minnows, so they put the feed bag on, which affects the fish. At least that's the cliff notes, so it can definitely enhance the bite, unless you're on a reaction bite in the first place.
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