To continue with this theme, another answer is
what the ‘inside block’ can turn into.
The movement that begins as a inside block changes with another
Circular movement and becomes a backfist strike.
Thus the inside block becomes a strike
moving through the space provided by the attacking arm.
Again the transition from the inside block to backfist strike is done with a circular motion, when done with a shift in the hips becomes another force enhancer.
This also permits you to be unpredictable in your use of technique.