It's that bloody Gryffindor indignation that Hermione has perfected. Her reputation proceeds her for a reason. She's a mouthy muggleborn, but how many could ever accuse her of acting without thought or reason? She's regrouping, but when Ginny attacks, she couldn't look more surprised. "Ginny!"
Goyle falling on the already hurt Ginny spurs Hermione to action however. She launches from the floor and pushes him off the girl with what strength she can muster. "Ginny! Stop!" She doesn't want to see the red head hurt, and right now, they were in dangerous territory.