Dr. Zakir: That means the Prophet recommended that you should snuff, put the water excessively in your nose except while fasting, indicating that if the water goes through the nose into the throat, into the stomach it will break the fast. That doesn't mean putting water in the nose is prohibited.
So normally when you put water, it doesn't go into your throat and even if you snuff excessively always it doesn't go, it can go. So it's a precaution the Prophet said that don't snuff water excessively while fasting. Otherwise you have to do that. So this Hadith also proves that putting water in the nose it s permitted but you have to be careful you should not snuff excessively so that it goes into the throat. Otherwise the water goes into the throat and the stomach either via the mouth or the nose it will break the fast. But unintentionally while doing wudhu or while gargling if the water does enter InshaAllah, Allah will not hold you responsible because it's done unintentionally.
Yusuf Chambers: Ok... so it all goes back to the issue of intention, pleasing Allah, seeking the face of Allah (Subhana wa Ta'ala)