[hellinahandcart]

N I D A L
L A D I N

Eek. Don't ask me why, but that just gave me a severe chill.

Anyway, I think WHCTSLADIN is a just-coined-last-night acronym for We Have Caught The Sniper Like A Duck In a Noose, but since is was important to the sniper that the words be said in that order, it may indeed be a signal to others.

[hellinahandcart]

N I D A L
L A D I N
Like A Duck In (a) Noose.

And Nidal to Ladin represents over a quarter century of Islamic terror.

Don't mind me, I'm just musing about what it could mean(and I'm really creeped out too).