Cecil, W5DXP wrote:
"Given two coherent waves traveling in the same path with the same
magnitude and opposite phases, wave cancellation results from
destructive interference."

The waves don`t cancel out. Anything in their path just receives equal
and opposite influences and the effect of the waves is nil.
Sound cancellers which generate equal and opposite waves are an example.
Either the sound or antisound sources alone might be deafening, but
taken together, there is relative quiet.

Best regards, Richard Harrison, KB5WZI