I was testing the heck out of the shard bombs, spamming them everywhere. And I noticed Mist Walls behave a bit inconsitently. For the most part, they acted like normal walls: two to three shards could "cluster" (bad word, nothing ever clusters, just gets a bit more of a straight line), or would disappear if too close. But sometimes a shard would pop through the wall and appear on the other side, out of sync with the others. It's like it tried to stick to the wall, but missed, and spawned on the other side.