When price touched a high of $2.05 per share on 9 Feb 2011 and declined to a low of $1.57 on 15 Mar 2011, the OBV declined rather sharply as well, suggesting heavy distribution.
However, as price declined from a high of $1.92 on 11 April 2011 to touch a low of $1.66 in the last session on 6 May 2011, the OBV declined much lesser and, in fact, the OBV is much higher compared to where it was on 9