Why did Gandalf let go and fall off the cliff?

[Neferchoirwen]

I can accept PJ's version of the Bridge. There's more drama to it, I agree.

Or maybe he just wanted to die atleast once...and the comeback all flashy and such...I would do that if I could

Hey, I would do that, too.

Sacrifice is the main thing there, though. He knows that he is a powerful individual, but that doesn't mean that he has to escape.

Which brings me to another question: Why didn't he use his powers then?