Magos, the rules of the RP are quite explicit, you are not allowed to kill someone else's character without their consent. Full stop. If Lantz does not want Connor to die then Connor does not die.
And, I'm pretty sure your maths is way off there. If the shot moves at 1300 FPS and they're within 12 feet, then Connor needs to move at about 100 FPS to avoid it (he only needs to move a foot or so). Which is pretty doable I think.