Did Maedhros kill Laughter?

[Nerwen]

Originally Posted by Urwen

I've got another scenario.

(Dagor Dagorath.A bunch of plotters talk quietly)

Haleth:So, we'll betray them like Uldor betrayed us?

Lalaith: Yes, that's my idea.

Caranthir: And a good idea it is.

Beleg & Turin:Sure!

(Scene fades...)

Mwahaha!

Mwahaha... what?

Urwen, mind clarifying what's supposed to be going on, and who is being betrayed? (The Valar?) I just want to get everything straight before I deliver the inevitable smackdown.