Right. The future is uncertain. It’s impossible to know whether there will be any orders at all in the order book a second from now. But as soon as you place yo

Right. The future is uncertain. It’s impossible to know whether there will be any orders at all in the order book a second from now. But as soon as you place your sell order, a proper order book locks all other orders such that they can’t be pulled until after your sell order has executed.