Since they have four arms also..... would be nice.
Lets make a poll

"Four arms, more weapons"
You have my vote !
So back to topic:
I donīt think he gets a secondary attack with the Handcannon.
The rules for sec. attacks apply normal. so if you canīt use another weapon than the primary one (which you canīt with the polearm whats covered by the rules -OK its covered for both hands and not for 4, but follow the reasoning through first- since nothing is otherwise stated) you get a sec. attack with the primary. In this case the Azoghar.
Other way round, if you use the Handcannon, you get a sec. attack with the Handcannon, since you canīt use the sidearm with the polearm; same reasoning as above.
Since the Behemoth has two weapons, you can choose what to do.
Two attacks with the handcannon or two with the azoghar.
I would advise the handcannon

OK, the pic implies he wields both at the same tiome and it looks pretty cool, but thatīs what I fish out of the rules.....
