Brother Muzammil and I have been in contact in relation to this and he has done tawba for his challenge. May Allah keep him steadfast upon this. Amin
In the beginning of the post Nabeel Afzal is refered to as Mawlana Muhammad Nabeel Afzal, then further down it's written as Mawlawi Muhammad Nabil and then further down from that it's written as Mawlana Muhammad Nabil, then it changes onces again to Mawlana Muhammad Nabeel then to Mawlawi Muhammad Nabil, then finally at the bottom the spelling has changed again to Nabeel Afzal. Seems strange to have so many variations in spelling a name, especially if it's ment to be a post that was written by one person...
A few years back Shaykh Asrar Rashid challenged to debate Zaynul Aqtab Siddiqui on the same topic, however Zaynul Aqtab repented. With regards to Nabil Afzal he is a complete majzub and should remain within his limits and not portray himself as an alim or Shaykh. Also a humble request to brother Muzammil, you should not make open challenges without prior consultation with our senior ulema as this creates disunity and conflict within the Ahle Sunnah when challenges are being made amongst the public.