* His deep love and care for Hermione: Ron has always been fiercely protective of Hermione, and witnessing her being tortured by Bellatrix Lestrange is deeply upsetting to him. He feels a sense of responsibility for her well-being, and the fact that he can't do anything to help her adds to his frustration and anger.
* His helplessness: Ron feels utterly powerless to intervene in the situation. He is trapped in a prison with no way to escape or fight back. This sense of helplessness fuels his anger and desperation.
* His own fear and insecurity: While Ron is brave, he is also terrified of Bellatrix and what she might do to Hermione. The fear he feels for Hermione's safety and well-being further intensifies his anger and frustration.
Ron's anger is not just directed at Bellatrix but also at the situation itself. He is furious that he has been put in this position where he cannot protect Hermione, and he blames himself for not being strong enough to do so. This guilt and self-blame further amplify his anger.
It's important to remember that Ron's anger is a manifestation of his love for Hermione, his desire to protect her, and his frustration at being unable to do so. It's a natural reaction to a horrifying and traumatic experience, and it highlights the depth of his feelings for her.