Uses the spell he found

As Ron turned he slid his wand from his pocket. Before Hermione knew he waved it at her speaking "Ut ligatis"

A flurry of activity happened all at once. Ropes suddenly appear at different points if her body. Both her arms get tangled with rope at her elbows, slowly they pull her arms back. She can feel the rope move behind her back, pulling her elbows together. The only stops when her elbows are touching behind her back.

"Ronalmmmmppffffft" The moment she opens her mouth a ball forms, quickly it grows in size until it fills her mouth. She tries to spit it out but she can't because a leather strap is holding it in place. Hermione tries to move, her finger tops struggling to reach the gag as more ropes form.

Ron watches wide eyed as Hermione struggles, but the ropes quickly tie her wrists together. While her arms get secured, rope wraps around her legs at her ankles, then above and below her knees. The final struggle is taken out of the powerful witch as the rope extends from her elbows to her ankles. She pulls against the rope but falls onto the couch as the rope pulls her bound ankles to her elbows effectively rendering her immobile. Hermione doesn't stop struggling though, she fights until Ron moves over to her, gently touching her face to brush the hair away. Abruptly she turns to him, the anger evident in her eyes.

"Uunmhmu Wnmhfmnu ufh mnff mn uuff uf ffhmf ffhmng uhmghff nuuh uuh Uh fuhnmhuu ufh uhmmmfh uhnguhnff mff fuuh ffhn uhnmmf uf ufhuu fhuuhff mmfn" She speaks quickly into the gag, with nothing but nonsense coming out.