Do you mean you cut the rhzome in two and one was a back bulb and the other was a lead bulb and one now has a root and basal bud and the back bulb is kaput? This is the only way I can picture what you are saying.
When they sell Cattleyas, as seedlings, they are about 1 to 2 years old and have several canes (called pseudobulbs). The lead cane is the youngest and it is where the flower and new bulbs come from. Old bulbs are called back bulbs, and provide energy to the new bulb but are not going to have any more flowers. The strength of the plant is on how many bulbs (canes) there are. The larger the plant, the more ability to survive. When you cut them off you weaken the plant, but with TLC the plant may rebound. In nature, an animal might eat a chunk out of a plant, but it will still survive, though it may have a scar.
Why don't you plant the one with the nub and root in a very small pot with some small bark chips and water it once a week.
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