Reddit mentions of Harry Potter and the Half-Blood Prince (Book 6)

Sounds like most of the Harry Potter and the Half-Blood Prince.

>"You are protected, in short, by your ability to love!"
>
>— Albus Dumbledore, Harry Potter and the Half-Blood Prince

It might seem rather silly of course, but throughout the series there has been an indication that love and pure desire to protect someone often fuels more power in a way?

There's no doubt Bellatrix may be a more professional and skilled duelist, after all she was Voldemort's right hand and trusted "general" but the circumstances in which the duel took place

• Harry's protection over everyone in willing to die for them
  
• Molly's grief and anger over having lost her son and fear over losing her daughter as well
  
  simply those two might have just fuelled something stronger to help her defeat Bellatrix.
  
  This added to the fact that I guess sometimes we overlook characters like Molly Weasley simply because they haven't been on the frontlines of a battle?
  
  all we have ever known about her was the sweet fussy motherly person who made sure you ate extra helpings, got the best jumpers in christmas and was someone you wouldn't want to cross because she can be very tempestuous when angry.

Wow look! Here's one!