To continue with this theme, another answer is what the ‘side block’ can turn into.
The movement that begins as a side block changes with another
Circular movement and becomes a vertical knife hand strike.
Thus the side block becomes a strike moving through the space
Provided by the attacking arm.
Mike Cassidy demonstrates this below.
Another look at the technique movement is provided
By Devin VanCurren
Again the transition from the side block to the vertical knife hand 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.