Who the fuck partially fills a limit order for 0.1 BTC and then goes away again?
This has happened to me quite frequently. You just happen to have your order at the reversing point. I think that it is good sign.
Sometimes the remaining portion fo the order does end up getting filled, but frequently when an order gets partially filled, I get a kind of feeling of how much of a "genius" I am in terms of my order placement... sometimes, I cancel the remaining and sometimes I will just leave it and see if it later gets filled. If I leave it, then frequently, I will set a partial contrary order, just to cover myself on both and it becomes more fun, because I feel that I get an additional opportunity to make some extra money by setting another partial order on the other end and then just wait to see which one fills first. That part is like a game, and fun and generally profitable, no matter what.
It happened to me too, and when it happens I feel like a genius too! I never set a partial contrary order though. Gotta try that, it must be fun playing wait and see which one fills first. Nice bit, JJG!