The trick here is wireless flash and the placement of multiple remote flashguns in strategic positions. There is one gun behind the tree stump, towards the low-center of the image, hidden by the tree itself. Another one is hidden just off the frame on a tripod, shooting down on the ice at the low-left part of the image. This gave the ice this wonderful, diamond-like texture.
A third gun was placed on a stand to the left of the frame, bathing the frozen brunches with light.
Photography and luck go hand-in-hand! See that magnificent light coming through the clouds? I never planned for that! It was just there, the right time!