However , the three of them are unable to defeat Bellatrix and stop fighting her once Molly Weasley orders them to disengage .
In the final battle in the Great Hall , Hermione fights Bellatrix with the help of Ginny Weasley and Luna .
The three of them are unable to defeat Bellatrix and stop fighting Hermione once Molly Weasley orders them to disengage .
In the final battle in the Great Hall , Hermione fights Bellatrix with the help of Ginny Weasley and Luna .