The 10% trailing stop kicked in at exactly the same price I bought this at, causing me a slight loss of the $10 in broker fees.
This was my first attempt at trading after a gap (and a pretty large gap, at that) and I think I probably misread it in several ways.
First I think the ADX and MACD values were probably strongly skewed by the huge overnight jump. Also, it appears it’s pretty common, in fact pretty much expected, for a sell-off to happen shortly after a gap up – so this should have been expected.