Musings and a question

[jeanico2000]

No: HPFGUIDX 81360

I was having breakfast with my daughter early this morning and we 
started talking about OOTP. Neither of us could remember who taught 
Harry how to cast the "Protego" shield and I don't have the book 
handy right now. Could someone please remind me so that I can resume 
the debate with my daughter over supper?
Also, we were wondering why nobody tried to stop Harry from going 
after Bellatrix. Dumbledore ends up saving Harry and fighting 
Voldermort, but why did none of the order members go after him to 
help. (Or try to stop him with a well placed "Petrificus")Just 
wondering. Any thoughts?
Have a great day,
Nicole