When everyone looked down, they realized that this piece of ice was a frozen river in the mountains. The edge they came to was a frozen waterfall winding down (the appearance of the waterfall can be unusual and unusual. So steep).
Everyone looks down and realizes that the ice is a frozen river in the mountains, and they come to the edge of a frozen waterfall that meanders down (the waterfall can look less unusual and not steep).
When everyone looked down, they realized that the ice was a frozen river in the mountains, and they came to the edge of a frozen waterfall winding down (the waterfall can be unusual and not so steep).<br>