Ouch, there isn't much energy in that bulb so you probably won't get much more than an inch or so of roots before it runs out of gas and dies.
This is what I would do. Drop the pot in some water so that the spag absorbs water from the bottom. Once the spag is soaked through, pull it out and let it dry in a warm spot with decent light. The new roots are still short enough that they shouldn't be negatively affected by wet spag since they don't appear to touch. The moisture absorbed by the old roots (if they still function) should provide enough energy for another month of root growth. If you do this, can you post pics a few days after the soak? I'm curious to see how much (if any) the back bulb aborbs.
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