The Exocrine has the special rule Weapons Beast, which lets it fire all of its weapons twice in the shooting phase. Does it have to fire both times at the same target, or can it be two targets?
Similarly, there's the stratagem Single Minded Annihilation that says at the end of the Shooting Phase, you can select one unit to fire again. Does Weapon Beast happen here, allowing four shots in one shooting phase?
For your second question, it doesn't because SMA is infantry-only.
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For your second question, it doesn't because SMA is infantry-only.
https://www.warhammer-community.com/2021/02/02/even-the-new-terrain-wants-you-dead-in-kill-team-pariah-nexus/