What exactly does Shredder say to Danny?
 

Sounds like he didn't say anything.

Ahhh..........
or
haaaa........

Shut up makes some sense to me only because Danny was about to speak and he stopped him. Just my humble opinion.

I see/hear what you mean, phonetically it's very similar, but I think it's just a Kiai.

It could very well be a Kiai.

Not the best thread, I just wanted some second opinions because I've often wondered about it.

Actually after listening again he might actually say the word Kiai. Could be a bone toss to those who understand Japanese culture.

I always thought its was just the sound of his gauntlet blades

he said nothing, it's just sound of the blades tweaked a little and maybe a sound of Danny reacting...

ha
 

you actually made the thread. nice. but yeah I really don't think he said anything.

How does he say nothing? There is clearly a voice alongside the blades and it's Shredders.

If I had to guess..he told Danny to shut up in anger when Danny went to come up with another lie.

It's just a grunt. SHYAA or some ish like that. It's definitely not an actual word.

I disagree but I won't defend it to the death stubbornly.

Lol, what a small thing to talk about.