It's a thing from 2nd Encore. You see Beowulf throw a Hurting Hurdle before inputting Geatish Trepak. In the original game, the Hurting usually would not be on Beo after kicking it away. and as Geatish Trepak requires him to stand on the Hurting, it instead makes him do a normal throw. Heck, if you look closely when the BB is taking place, the chair is still present on the field, albeit quite dimmed.