Shenanigans! Shenanigans! Shenanigans!
Bobby hasn't "iced up" since 2002. He physically transforms his body into an ice form that resembles a humanoid shape. He can't "get his bell rung" while transformed, because there's literally no brain to concuss!
Poor research! Bad writing! Continuity! Shenanigans! Shenanigans! Shenanigans!