Narthecium is mounted to character arm. Does that occupy that arm, or can a character wield weapon in that arm?
Looking at a picture of a Narthecium:
The hand is clearly still free.
If you wanted to use it to hold something like a heavy flamer (which is underslung from the trigger grip) I might call shennanigans, but otherwise, the hand is free for whatever you want it for.
Does tearing works with extra damage from righteous fury? Can you reroll extra damage die from Blood Angels solo mode?
There's no specific guidance - the Errata rules say "If that second attack hits, the attacker may roll one additional Damage dice (1d10) and add it to the Damage total
Personally, I say no to Tearing, because you've already had your one bonus damage die and discarded the lowest; this damage bonus is part of the same damage roll. As to rerolls...more open to being convinced, but for simplicity I'd say no for the same reasons.
Bolt pistol in melee vs hordes? Can I only make standard attack? Do I get any bonuses to attack?
The size of the horde, I would assume, because that's a universal bonus. You don't get the bonus for being at point blank range (although you do count as being at point blank if you have a weapon with Scatter).
Can you disengage the horde, as they are multitude of enemies, which surround you from all sides? Or if you just walk away and full auto burst at point blank, do you get Attack of Opportunity?
I would say yes to both; the horde fights as a single enemy for the most part, so attacks of opportunity and disengage actions should work as normal.
That said, I would consider carefully if a player's move from a disengage action actually gets them clear of the horde - if the kill-team is fighting a horde across a barrier, then disengaging backwards from the barrier and away from the horde is fine. If you're in the centre of a small-ish ork mob but you have a jump pack, you should also be able to get clear. But if you're inside a huge mass, and the nearest 'edge' is more than your allowable move away, then logically you can't disengage, any more than you can dodge a blast bigger than your half-action move, because you can't move far enough to get clear.
Edited by Magnus Grendel, 04 November 2013 - 09:05 AM.