IMO I think you should ALWAYS have some kind of hard stop in, even if it's below your mental stop just as a worst case scenario should your connection or computer crash so your brokers server will have you covered. (Be sure your broker offers serverside orders)
And rehearse and plan what you will do should the eCBOT freeze and execute.
I've never had to so I dunno how I will handle this when it pops up but I know what I "should" do.
This is what will separate the retail and the more professional trader, and who blew out an account or who just had another day in the market.
I'm with The Shadow, that was a helluva drawdown and am curious how leveraged and what trade was put on?
Sorry for the loss as well.