Back when David was still a Spryher, he had discovered the devastating might of those waves and it had help him crossed through difficult situation easily.
But not without a price. It always in one way end up destroying the tissues and the cells in his body the longer the waves stayed in his body.
Usually, he was always cautious about the quantity he produced so as to not kill himself, annihilating his body from inside out in the blink of an eye. And also, his body wasn't nearly strong enough to withstand the destructiveness of that specific frequency of wave.
But this time, David totally threw caution to the wind as the situation was dire. He didn't only produce a small amount of the wave this time, he oscillated every inch of his muscles at that dangerous frequency, making the miniscule amount of disastrous wave explode like a tsunami!