rpvee said:

I do have a guess as to why they did the "NO". Granted, it'd be a very stupid reason, but I wouldn't put it past them to care about something so trivial and not saber colors.

It's a tradition to have a dramatic "NOOO" in every Star Wars film:

TPM: Obi-Wan after Qui-Gon is stabbed.

AOTC: Obi-Wan upon Anakin's charging at Dooku.

ROTS: Anakin before attacking Mace/Vader after waking up.

SW: Luke after Obi-Wan is killed

ESB: Luke after learning the truth.

ROTJ: Some argue Luke screams "NO" after Vader threatens to turn Leia, but "officially" he says "NEVER". So as far as I can recall, there was never a "NO" in Jedi... until now.

Granted, I AM NOT SAYING THIS MAKES THE NEW "NO" REASONABLE BY ANY MEANS. It still sucks like hell. I just wanted to point out their possible motivation.

It's like poetry! Repetition. I bet he hoped it would work!