I quite like this idea. It adds style and is canon to the series. The thing I like about bending is the level of interaction, this particular area being countering. A waterbender counters tends to counter water by redirecting it, but I always wondered if there should be a way to counter ice. If waterbenders can shatter the ice projectiles like in the series that would make a lot of sense.
We have seen IceBullet being countered in the series, but I wonder how that would be in Minecraft. A counter for a combo ability is not something we've ever encountered before, but I get it. perhaps this counter could work on an ability like IceSpike or IceBlast. I mean, it probably shouldn't matter all too much which abilities, but I wonder about how it would be with combos.