I finally got around to test the sword while 2-box'ing our Corsair mule who just recently reached Lv50:
1376 rounds of attacks (unless Notepad++ failed me again) while being under the effects of Fighter's Roll as War/Nin
COR rolled:
6, 9, 8, 4, 4, 7, 7, 5, 5, 7, 6, 8, 6, 7, 8, 8, 5, 10, 8, 5, 8, 6, 8, 6, 7, 7, 5, 6;
Ridill proc rate (+18%~ - assuming the final bonus gets dwindled down due to the difference between the Corsair's and the Ridill owner's level, respectively 50 and 75), read below for additional informations - ?): ? 26% single attacks, 59% double attacks, 15% triple attacks.
Don't take this for granite though.