If a tree falls in a forest, does it make a sound
Depends if someone is there or not
But does science have to stoop so low as to depend on personal subjectivity for a sense of objectivity to be claimed?
Do cracking wood and clashing objects release sound waves? The answer is yes.
If the creature reformed the gap then why did it still lose health
Because it's amorphous, and while it lost goo, it has less to re-form itself.
For action, either swing for an area where there would be a lot of loose too, like liver/small intestinal region, of just go for the neck if that matters.