If you only had one leg, what kind of footwear would you put on the end of it if you were planning on being on a train?
Yeah, I wouldn't have thought "a rollerblade" either, but there's someone out there who disagrees with both of us...
Two canes and one rollerblade, punting down the L train platform at 1st Avenue.
Personally, I would have just gone with the idea that with nothing to brace, or brake, myself and with the "ground" moving as if an earthquake were in the offing, traction is something to which I would ascribe a lot of importance.
I can only assume there's a pretty steep learning curve involved in that decision.