I've just been looking at the tumblr feed and the padlock seems to be to secure the wrist coil back to probably the cuff.
Then you need to wait until the ice melts before you can undo the padlock and get free.
I'm looking at this. A few things don't make senses,
I get the first tie, simple enough.
But it then jumps to a third part of the tie, and the forth part of the tie seems too omit the second tie.
The last part of the tie, the padlock, should show a steel ring for the padlock.
All in all, I do know pretty much how to do the tie.
To me, if the rear elbow coils are loose enough, you might be able to bring the knees together somewhat and by bending forward, your mouth just may be able to undo one of the wrist coils.
But a trial run without the elbow coils would be a good start.