What is with big jump in short position after the deal was announced.

Short History
Symbol Report Date Volume Change % of Float
  UUU - T 2013-01-15 27,036,807 15,526,993 2.82
  UUU - T 2012-12-31 11,509,814 -12,248,393 1.20
  UUU - T 2012-12-15 23,758,207 10,799,659 2.48
  UUU - T 2012-11-30 12,958,548 -2,027,748 1.35
  UUU - T 2012-11-15 14,986,296 -1,300,110 1.57
  UUU - T 2012-10-31 16,286,406 88,651 1.70
  UUU - T 2012-10-15 16,197,755 -255,289 1.69
  UUU - T 2012-09-30 16,453,044 -467,142 1.72
  UUU - T 2012-09-15 16,920,186 7,557,310 1.77
  UUU - T 2012-08-31 9,362,876 -7,851,943 0.98