Really? I don't think Neville was scared of Luna at all, it was more of...Luna was a bit dotty and Neville would just prefer not to be noticed by her, and was trying to get out of conversing with her. Ginny scolds him afterwords, at least I think, because she can see that hes trying to get out of talking to her. And I totally think that a new wand will be an issue for Neville, though he was getting really good in Defence against the Dark art lessons without one, His Gram was making him use his fathers wand because it was his....fathers, and his Grandma seems to have an obsession with Neville being like his father.