Sluggo said:

Here's my thoughts on Vader screaming...

"Noooooooooo!!!!!"

Sluggo, you're absolutely correct!

There's been a lot of bashing of Vader's last line in ROTS, but it's his realization of his total culpability in the death of the woman he loved (and who, inexplicably, felt deeply for him as well).

But here, watching his sole offspring (so far's he knows) fall to his death.... I can see it. That same scream. That same horrifying moment that the beauty of life is ended.

Wise counsel. Vader must scream.