Looks like a stolon. It's like a runner that comes from under the crown and pops up away from the plant as a new growth. The Parvis do that a lot. I have a micranthum with one. My Paph Darling just shot up two, which confused me. But I just looked it up and Darling has 25% delenatii.
I know some Phrags will throw stolons, but I don't know which ones are more prone to it. Obviously one of those two!
No need to do anything to it. Congrats on the new growth!