A recent concern of mine is a gap in price that could occur in the ECN market.Suppose you trade with high leverage, and a piece of news hits that sends the next tick a thousand pips below your stop. Automatic margin call? No.In the real market, the next tick is what you get... which can send your account into debit.How bad could it get? What if a nuke went off? What would the market do?The bottom line: who want to owe the broker $10,000 because the market gapped on them in a trade, and filled them beyond a margin call? Improbable? Yes. But theoretical and I'd like to hear thoughts on this.