Falls sideways

Hermione struggles as best she can, applying more force to her left, at the same time that due to the tension or how short the tie is, she manages to free her hair, but also due to all the movement, it causes Hermione to lose her balance and fall to the left, still tied to the chair.

“MMMMPPPHH!!” the force of the crash makes her 'scream' coming out all cushioned, the fall and the way her legs are tied causes her to feel burning in her left knee and an increase in the pressure of the ropes by having to keep it fixed and now also support her weight.

Footsteps are heard coming down increasing Hermione's panic as she doesn't recognize where they come from.