another added understanding to the avbove masterpiece by my shaykh Imaam an-Nawawee is that the full reality of its implementation is really for the mujtahid or the faqeeh or muhadith, one who is qualified to access the reality of the person in question. commoners like use fall on a lesser scale reagrding the implementing of what nawawee said.

So just because it says what it says, yet he (nawawee) and a whole line of ulema did not make it permissible for the average person ot make a radd and make tabdee and hajr of a person they view to be a mubtadi or a daal

asalamu alaikum