pulcherrima - what are these purple roots?

[kmccormic]

I have a Pulcherrima which has purple roots and I'm not sure what's up with these roots - what are they?

Love this orchid, consistent bloomer with looooong spike that just keeps growing.

I've only had a year or two. It came in sphagnum which I'm not that familiar with. I repotted it into more sphag. I'd heard you should compact spag to keep it from being too wet, so I rolled it into balls and placed it around. Then I ended up having white fuzzy mold problems over and over so I guess I still don't get how to use spag. I'd potted it deep because it had some good roots at the bottom which I'd tried to keep. Maybe a bad idea it grows new roots to use as "pushers" to keep the plant stable? But as I was repotting it, showed me these mass of roots at the bottom - some purple - is it trying to send a runner to grow an offshoot or keiki?