No cause/effect relationship is implied at all

My dear Nunclage,

D'oh! I knew there were more categories of "neither" to allow for, and had actually referenced M-W not that long before. I'd meant (c) to cover this scenario.

Hey ho. Got a really nice definition out of you and boronia anyway - "non-causal, casual" will definitely stay with me

But there is definitely something about (a), which I'll make explicit elsewhere...