GR translation: crossover point

[Paul Mackin]

On 12/10/2011 3:17 AM, Mike Jing wrote:
> P14.40-15.8   At last, one proper Sherlock Holmes London evening, the
> unmistakable smell of gas came to Pirate from a dark street lamp, and
> out of the fog ahead materialized a giant, organlike form. Carefully,
> black-shod step by step, Pirate approached the thing. It began to
> slide forward to meet him, over the cobblestones slow as a snail,
> leaving behind some slime brightness of street-wake that could not
> have been from fog. In the space between them was a crossover point,
> which Pirate, being a bit faster, reached first. He reeled back, in
> horror, back past the point—but such recognitions are not reversible.
> It was a giant Adenoid.
>
> What exactly is the "crossover point" here?
>
Sounds like the point in time at which one becomes fully conscious of a 
fantasy.

Pirate's  efforts to stop short of this point--avoid the fantasy--are 
unsuccessful.

P