Phased into HBTX short; 1K @ 2.93 & 1K @ 3.09 for an average of 3.01. Exited 1K on spike to 3.33, 200 @ 3.05 and held remaining 800 o/n to exit @ 2.84 the following afternoon. Lessons: 1) Be very careful entering short positions in first 15 minutes of trading, 2) Holds can have a high opportunity cost in terms of missing other opportunities.