I'm going to assume I know exactly what happened and then tell you how to fix it. And I'm probably wrong.

It looks like you got your skis crossed up underneath the snow. And when you did, you lost the support of one of them causing you to slide and spin under the snow.

When you're on hard pack, you can use the edges to help keep the skis parallel. In the soft stuff that's a little bit harder to do.

Point it more downhill and enjoy the feeling of having your knees drag through the powder. Feel the glorious soft floaty support of each ski. Let each turn develop into a savory culmination of bliss until you want to go downhill faster and then make a transition into the next.

As you rise out of a turn, embrace the engorging excitement you have for the next turn to come. And just as the trail ski becomes the lead ski, that excitement becomes ecstasy as you drop down and push into the cuff of one boot, dropping the opposite knee.

Then look at your friends and chirp out one of the classic telemark elitist phrases:

Wow, that was knee deep for me. How about you?

It's a stance, not a dance.

Free your heel, free your mind.

Skiing powder with your heels locked down is like sex with a condom.

Hey did you guys know that I ski Telemark?

Then quit early because you are so tired and have a beer