Secondarily, it can help you move. Back to those ice skaters and dogsled drivers. The suspension caused by Isa can be used to buy time, although follow-up action is often required to truly remedy a situation. Isa can stop bleeding in an emergency, until medical help can be obtained. Use a tourniquet too.
Ice is brittle.
You can brittle up a situation with Isa before whacking it with Uruz and shattering it. The Old English Rune Poem comments on ice's beauty. Think of diamonds. The Old Norse Rune Rhyme and the Old Icelandic Rune Poem, however, both point out at least indirectly that ice is dangerous too. In the Havamal, Odin has a few words to say about ice as well.