KTM EXC 300 Win on Slippery Road [Video]
While this doesn't look like a “professional rider in in controlled situations” scenario, the drifts around tight corners with little visibility may seem not a very good and healthy idea. By all means, I guess I'd try to avoid doing this on a public with potential traffic just around the bend... but hen again, maybe it's just me.
With the second part of the footage being shot on a forest road with obviously less chances for a car to just pop out of nowhere, things look alright, though. If some of your are going to try this for yourselves, please make sure you wear protective gear and don't go alone. It's always a good idea to have someone with you when doing things which can go wrong.