I’ve just read TIHID and a lot of your posts here about it and I have to ask. When Light stumbled on the word “machinations”, he realized that his last actions had been prewritten. How much did he doubt his speech after that? When he started singing, did he wonder if that was really him, too?
He knew going into the room that he was under the control of the Death Note, but he didn't expect L to have actually tampered with his speech itself. He doubted everything that came out of his mouth after that, except one thing: his apology to the Task Force. Not because it was a last-minute impulse, but because he knew L well enough to know it would never occur to L to make him do that.
(Light was pretty sure the singing was his own idea, but since the reason he did it was to help him keep his composure/hide his fear rather than to send a personal message to the world, he didn't deeply care whose idea that was. Just as long as it worked.)
