The leeches attached to Gendry's skin were actually stunt leeches, designed 의해 the Props department to be as realistic as possible. No 동물 (or Joe Dempsie) were harmed in the filming of the scene!
"It's a great scene and it's a great bear. Bart the Bear, 당신 can see his audition on YouTube. He's so cute. I wanted to take him 집 and have a 곰 myself -- a 1,200 pound 곰 in the backyard."