root health

[birdbrain]

I repotted my #2 phal (I think) today. I've repotted another phal that was in terrible shape. Seems to be hanging on. #2 excellent roots upon inpection I think anyway. My question is one of the larger roots looked like there was a bulb inside the root oblivious larger rounder that the root itself same color as the root. I really regret not taking a pic when I had a chance. Could it be water that pooled up in the root? Clueless Thank you
Birdbrain