torsion bar is a *****

I asked that same question awhile back, and the consensus was a saws all wouldn't do it.
I used my cordless grinder, like this one, and it cut through the bar, like butter, in ten seconds.

It got cut, as the adjuster was frozen, rusted, locked up, solid.
Had to be cut in two, as the bar wasn't going to be saved for reuse anyway.

And there was no problem cutting it in two, with tension on the bar, as some may lead you to believe.
This is the real world, and you gotta do, what you gotta do, in getting a rusted bar out.
If there ever was a "bang" i never heard it above the sound what one of those grinders makes.

Just my .02 cents on the subject.
I already went through it.

DeWalt grinder.jpg