I was playing on "The White Star" second battle, and I played a bungled heal on one of my party. The kobold nearest me then attempted to, and successfully, blocked it. It doesn't seem to me that they would want to even attempt to block it, much less succeed and lose out on 5 health and a block.
Yeah, it's a feature. Enemies will use block cards on both beneficial and harmful cards so you can use Minor Heals etc. on the enemies to use up their block cards. From a story standpoint: The kobold can't know what kind of a spell you're casting on it. It's better to block anyway since most of the time the big bad heroes aren't going to be casting something good...
