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PhilGoetz comments on Particles break light-speed limit? - Less Wrong
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It shouldn't. Moving from B to A slower than light is possible*, moving from A to B faster than light isn't, and you can't change whether something is possible by changing reference frames.
*(Under special relativity without tachyons)
My question is whether he meant to say
or
both of which involve moving faster than light.
I meant the first one: faster than light in both directions.
You can think of it this way: if any reference frame perceived travel from B to A slower than light, then so would every reference frame. The only way for two observers to disagree about whether the object is at A or B first, is for both to observe the motion as being faster than light.
I know Owen was not talking about impossibility, I brought up impossibility to show that what you thought Owen meant could not be true.
Moving from B to A slower than the speed of light does not involve moving faster than light.