Selamat ,diraf, all helicopters have a measure of directional stability;that is,they are like a weathervane,pointing into the relative wind,in the normal flight case,going forwards,and or sideways; that is a generalisation,as some,those withe long streamlined fuselages,are better than those with `skinny` tails.However, hovering tail to wind/downwind alters the airflow pattern around the fuselage,tailcone,tail-rotor,horizontal stabiliser,and you are now in the regime of the weathervane,with a larger `side-area` being affected,and any slight yaw will attempt to make the aircraft want to turn back into the natural wind. So,it requires a lot more `work` on the pedals to keep the helo pointing `downwind`.Anyway, most helicopter pilots are very `light on their toes`,and the really good ones wear `dancing shoes` anyway...!!!!.