Because this implosive collapse is dominated by the inertia of the liquid surrounding the bubble, and there is little stiffness supplied by the condensing vapor (only the small amount of residual gas contained within the bubble), the energy density can become much larger than that originally present in the sound field itself. (scientificamerican.com)
As for the wrapping I like to wet the wrappers until they are getting softer but still keep a little stiffness. (greenkitchenstories.com)
You just constantly face guys that «have a little stiffness» or are «sore». (sbnation.com)