Montana. Someone posted this footage on reddit a few days ago.
https://www.youtube.com/watch?v=Tp5A5YRd43E
Did this cross the skin track? Reminds me of the stuff that's been posted about WB Cowboy Ridge the last few days. Surprised it didn't slide where skier #2 was standing. The side angle looks good enough to go too. Looks like he is standing on large surface hoar.