"[Ice obey my will and form a shield to repel my foe, Ice shield]!" Frost's voice could be heard in the distance chanting an aria for the spell [ice shield].
In response a magic crest swiftly appeared before the three frost dwarves and coagulating into a sturdy 3 inch thick shield of solid ice separating them from the ursa's fierce claws. No longer was Frost's [ice shield] spell half assed in appearance, misshapen in areas and flimsy in terms of its defensive properties no it was now a fully bona fide shield worthy of its namesake. However this was no mere enemy, the power behind a C-rank monster especially one so physically inclined would not be stopped from a mere shield spell, especially one that was only of the 2nd circle.
Thankfully the point wasn't to prevent the ursa from smashing down merely to delay it so the frost dwarves could escape.