Ron had no idea how long she would be out for, so he acted quickly. He levitated Hermione gently onto the stone table at the rendezvous point and castRelashio, binding her to the concrete as he trusted his brother Percy to put up the defensive wards. He took out his silver knife and cut off some of her hair as well as made a shallow cut on her left forearm to collect a sample of her blood, grimacing at the "MUDBLOOD" scar that Bellatrix had carved into her. That's when it all started to go wrong, when they got captured by the Malfoys and he wasn't able to save her from being tortured.