You had left Umbridge's office a while ago after she tortured you with the wound-causing pen that wrote with the punished's blood and caused wounds on your hand.

When you arrived at the great dining room and sat next to Fred, he gave you his legendary smile, and when he was going to start saying something funny as always, he noticed the wounds on your hand that were showing under your sleeve

Fred, without thinking twice, grabbed your wrist, under your sleeve, and saw with anger and horror the wounds on your hand

• Don't tell me that bitch did this to you... - said Fred, referring to Umbridge in an angry tone while his face maintained a worried expression