189 through heavyweight kids rarely put the legs in to work for a turn. When they do, especially early in a match, it is very difficult to get a turn out of it especially if the down wrestler is physically strong. But it isn't a stall when you are attempting an offensive turn with the legs and cannot turn them. In this position, I beleive a stalemate is in order.
Stalling would occur if the bottom man were not making any attempt to get out just as well. In this position, with a big wrestler using a leg ride, they will not just unhook their legs and try to scoot back to another break down. Moving backwards (i.e. bailing out) of a technique is dangerous. Do not penalize an offensive wrestler for attempting an offensive move when in fact the bottom man is capable of not being forced over. These two wrestlers in this exact position is the definition of a stalemate.
In my opinion the referee should give the offensive wrestler, the risk taker, an opportunity to work the hold for a turn. The percentage of risk for a wrestler to become off balance or to have their hips sag when throwing legs in becomes higher when weight classes go up. This is why only a small percentage of 215 and HWT wrestlers are ever seen throwing the legs in.