This might be a naive question, and forgive me if it is. Has anyone ever made a trade in ES outside the spread in order to bump the price down to or up to a critical level or initiate a run in the pre/post market? For example, right now at 8:23 EST, ES is trading at 974.00, spreading 973.75/974.00. If I shorted below the bid at 973.50, then again immediately at 973.25 and again immediately at 973.00, etc, pushing it below its temporary support, would the market necessarily reject this motion, or is there any chance it would follow? Does anybody do this, particularly outside regular market hours? Just how strong are the arbitrage forces that keep ES in predominantly tight overnight ranges on extremely thin volume?