The erratic action of a jigging spoon can entice fish that otherwise might not hit. Usually they strike as the lure drops. I've also had good success retrieving spinners the same way, particularly sonar-blade styles such as the Luhr Jensen Tiger Tail and the Panther Martin. A spinner has an entirely different action than a spoon when retrieved with a jerk and a pause, but is just as effective. When jigging in fallen wood, hang-ups are inevitable.
Inactive fish tend to be deeper than aggressive fish, which suspend.
In some instances, you might be able to sit in a canoe or belly-boat, right over the fish, and jig a spoon vertically like an ice angler. In recent years, this has accounted for trout when nothing else was working. Rip the rod tip up and then follow with the tip as the lure drops. In some instances, quickly reeling the lure to the surface and dropping it down again triggers a strike. Stopping the spoon in mid-jig and letting it sit still also can occasionally cause a fish to hit.