When moving out of range, the Warden can sonic charge, but visually doesn't do the sonic boom

If you anger the warden and be 19.9 blocks above him(honey block, soul sand, mud, grass path, etc...) wait for him to start the sonic charge animation, before the sonic boom and step on a normal block (20 blocks above him), he will still do the sonic charge, without the sound and won't do the sonic boom. It doesn't have to be 19.9 blocks, it is enough, if you are fast enough to quickly jump to 20 blocks.