Like I have maintained:
Most bb's of today have NO biceps peak.
hes twisting his wrist forwards towards the camera to give his biceps more length which in turn gives them less peak......
bodybuilders with short biceps normally do this to make their arms fuller in the double bi pose.....
he obviously has quite flat biceps ..... which makes me wonder why he is twisting his wrist to take away any peak he might have....
my guess is ..... he doesnt know why he is twisting his wrist..... and that he maybe seen other guys doin it and thinks thats how everyone should do a double bi pose......