I have a current short position on in NIHD (NII Holdings) that is in my Swing account. This trade has had an unusual behavior to it in that it gave the appearance of solid support above the 22.50 level.
However, my perspective on this has been that it was just a normal Bear/Bull battle to hold that level. Here is a current chart showing the action on the 5 minute chart (what I watch for open positions):
As you can see, there was some really good volume yesterday. The Acc/Dist line actually was diverging from price as well. Now today you see that it finally gave up the 22.50 level and is likely going to hold the 22 level for today.
For now I have a trailing stop on the short position set to 3% and will let that ride.