Spoiler :
There was an interesting subtely in that seen. Anakin had his two lightsabres crossed.... it was at this nexus at which he turned to the dark side.... the rest was procedural.
In this scene, he had two lightsabres, one blue and one red. I believe one was his, and one was Dooku's (I've only seen it once, but that will change soon...
)
Later, he demanded a trial for palaptine, as some sort of sense of justice, he claimed loyalty to the republic in this case, yet in the Dooku scene, he did as Palpatine asked... no trial.
In this scene, he had two lightsabres, one blue and one red. I believe one was his, and one was Dooku's (I've only seen it once, but that will change soon...

Later, he demanded a trial for palaptine, as some sort of sense of justice, he claimed loyalty to the republic in this case, yet in the Dooku scene, he did as Palpatine asked... no trial.