Which does ‘rising’ here mean, to stand up or to get angry?

Question

Harry was sitting up on a bed in the hospital wing at school, surrounded by his visitors. Fudge, one of them, started to insult Harry. Did Mrs. Weasley want to prevent him from getting angry or from standing up and leaving his bed? (Psychologycally or physically?)

”Insane,” whispered Fudge, still backing away. “Mad …”

And then there was silence. Madam Pomfrey was standing frozen at the foot of Harry’s bed, her hands over her mouth. Mrs. Weasley was still standing over Harry, her hand on his shoulder to prevent him from rising. Bill, Ron, and Hermione were staring at Fudge. (Harry Potter and the Goblet of Fire [US Version]: p.709)

Answer 1

It means to prevent him from getting up from the bed.

Rising is the word for getting up from bed, similar to the rising sun.

The first two definitions from TheFreeDictionary.com are:

1. To assume a standing position after lying, sitting, or kneeling.
2. To get out of bed: rose at dawn.

You might say to a person you're waking up:

Rise and shine!

Here's the word in a saying:

Early to bed and early to rise makes a man healthy, wealthy and wise.