This question was "answered" by a post going off on a tangent about soldiers being able to fight without a sword. That post does in no way address the question asked if there are any spells that can be cast wandless and if so, how wandless magic works. It does not give "an in-universe explanation" (words and emphasis by the OP).
It fails to address the question.
Yet at least three separate "Not an Answer" flags (by users Gallifreyan, Mithrandir, and yours truly) were rejected.
declined - flags should not be used to indicate technical inaccuracies, or an altogether wrong answer
This post is not even wrong; it does not address the question and goes off on a tangent. It does not answer the questions, neither the one asked in the title, nor the ones in the body.
So why were these "Not an Answer" flags declined?