Rescued seedlings / damping off

A successful experiment.  I didn't have too many seedlings damp off, but I thought about the fact that when damping off occurs it only affects a very small area of the stem right at the soil/air boundary.  There must be something about that boundary that allows the infective growth.   

Now, tomato stems have hairs that can develop into roots if they contact the soil.  So I reasoned that if I took a damping-off seedling that had not yet wilted and (1) pinched off the roots below the damp-off site, and (2) replanted it deeper in fresh soil - with about 1.5 inches or more of the stem buried - and (3) treated with daconil and (4) kept it moist, then the stem would re-root and the plant could recover.    Tried this with two damping-off seedlings: an HC and an F4 46A-2.  Turns out it worked.  About 3 weeks later they both have started growing again - lagging behind the others by about 2 weeks of stalled growth, but now taking off.