Photo taken by setting the flash on Strobe mode with the following setting; 90HZ 40TIMES POWER 1/128 and placing a dark background at least 1 meter away from the subject and the flash should be close to the subject as it has just enough power to light the subject but not the background.
90HZ
40TIMES
POWER 1/128
and placing a dark background at least 1 meter away from the subject and the flash should be close to the subject as it has just enough power to light the subject but not the background.