yitay, keep in mind that She’ila doesn’t help after the Nazir finished
his Nezirus. Only according to Rebbe Eliezer, that holds that a Nazir
keeps all his Halachos until his Taglachas, can he be Shoel at that
stage. The Gemara in Shavuos says this.
Yeshno Besh’ila means that it has an inborn element of Dechiya.