Jane seems to be able to switch targets as quickly as she can change who she's looking at. She can attack many times in rapid succession with no apparent need for recharge.
Alice would have some ability to dodge Alec too. However, in a serious fight, where everybody's in melee, Alec isn't usually deployed - the fact that the power moves through ordinary space means he can hit allies just as easily if they're in the way. He's very useful if you don't know he's coming or if you're still trying diplomacy while the Volturi have decided that you need to be dead.
Vampires are not shown to use fire in the heat of battle (pun intended). They use it only to destroy defeated opponents - you shred the bad guy, then gather up all his pieces into a pile and set it alight. My guess is that non-vampire objects simply do not move through the air fast enough or undetectably enough to hit one that's still moving around. So when they fight, they get up close and personal, and they bite and crush and tear. I suppose you could kill vampires if you had a way to explode and ignite them and a large area around them all at once, so it could probably be done, but you'd need time to plant the dynamite.
My guess is that non-vampire objects simply do not move through the air fast enough or undetectably enough to hit one that's still moving around.
Bullets? Normally they wouldn't be much use but incendiary rounds with a sufficient firing rate should be effective in the space of time when the opponent is closing. Their closer proximity and forward progress makes it unlikely that they would be able to dodge. Especially against a team of 4 standing side by side. Recent developments in technology like that is something that is unlikely to have been fully inve...
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)