I notice recently for first time that I got or rather someone following my signals got a bad fill on the ES with a market. It jumped within a few seconds 1 point. It was a small order but more then 1 lot. Is it possible that HFT's dropped the bid on me or is that impossible? This was during after hours. I've also seen the ES "dumping" and jumping like something is bad wrong/different. Thoughts? Is this due to HFTs in emini and/or is it a sign of something bad wrong with the market? I know during times of uncertainty the market jumps more but this time it seems different. It looks to me like the institutions have pulled out.. leaving only robots. Also.... on related note, is it possible for a stop to get blown past and by how much in ES? I've heard conflicting reports on this. Every price must trade, right? Any idea what the worst slippage possible would be.. say during flash crash? I'm thinking the only possible stop gaps would be on the weekend or a 10% crash (limit breaks)..