I had the same exact thing happen. I ended up letting them both get a bit established, one of them totally DOMINATED the other one, which was a runt. They maybe had 2-3 sets of true leaves and the little one was very tiny, and I "plucked" it out of the moist soil and a little white root came with it. I then put it in a moist rapid rooter and acted as if I was cloning it for a couple days. It is now about 8-12" tall, healthy but definitely stunted, but still survived the ordeal