As noted above, the droid you seek is called a drift. I had my run-in with a wall at SP last year (on my sixth wedding anniversary, none the less, but at least she was there to help and pass the Jell-O shots), and spent five hours in Alan Olsen's* shop using all sorts of Implements Of Destruction removing a similarly bent bolt. I think we may have stopped at Sears on the way home that weekend to purchase an assortment of drifts to add to the race tool kit. It has become one of those "how did I get by without these" sort of basics I can't believe I never owned before. I haven't quite been able to justify a battery powered Sawzall (yet), but I do carry the plug in one with us now. I think of that as insurance. As long as you have the tool with you, it guarantees you will never need it.
* Kudos to Alan for giving us use of the space. He watched the incident happen in T5 and may have beaten me back to pit road, where he told my wife not to let me out of the car and to just had back to his to shop to work. Also kudos to Jim Thill who loaned me the drifts in the first place, Bret dePedro, Chris Windsor, various Meatheads, and Bad Al for coming by with words of encouragement and various Implements while we beat the s@#t out the car. It's things like that that keep me coming back to MARRS.
I have a battery powered sawzall...and while "it works"...I find it to be the biggest drain on battery out there. Very inefficient use of power since it only cuts on half of the stroke. Rather use a 4 1/2 grinder...or the plugin kind.