AtD translation: beyond reason

[Laura Kelber]

Instinctively, in his guts.

On Tue, Jan 19, 2021, 10:00 PM Mike Jing <gravitys.rainbow.cn at gmail.com>
wrote:

> P433.31-35   Lindsay shook his head at the tableau of chemical debauchery
> before him. For a terrible moment, he was certain, beyond reason, that none
> of these figures were his real fellow crewmen at all, but rather a
> ghost-Unit, from some Abode he wished never to visit, resolved on working
> him mischief, who had been painstakingly, intricately masked to look like
> Chums of Chance.
>
> What does "beyond reason" mean here?
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>