The way things are in Battle Nations, attack types (Contact, Direct, Precise, Indirect) function as a scale from best to worst with Contact being the worst (only hits whatever is in front) and Indirect being the best (hits whatever is in range). In healthy metas, there are counters to every strategy. Contact, Direct, and Precise all currently have counters, but indirect doesn't, this leads to situations where players can't really do anything to protect a unit such as during the recent Yazul boss strike where the Sandworm one shot a unit almost whenever it attacked.
Adding a new blocking type which gets in the way of indirect attacks, but not precise or direct attacks would add another layer of strategy and complexity to the game by providing a counter to indirect attacks. Doing so would also pave the way for creating more interesting encounters and improving unit diversity.
This blocking type could be given to units with a theme/focus around disruption such as the Field Agent or Saboteur with the justification being the unit disrupting targeting systems or something similar. It could also be given to certain planes with the justification being their strafing the battlefield making it difficult to line up a clean shot.