Simultaneity is kind of arbitrary anyway. Sure, in our reference frame it happened a long time ago, but for someone on another worldline it happened just a minu

Simultaneity is kind of arbitrary anyway. Sure, in our reference frame it happened a long time ago, but for someone on another worldline it happened just a minute ago. Anyway, for most purposes, it just happened. We couldn't have noticed it earlier, it could not have affected us earlier. I don't think it's that inaccurate to say that they watched it as it happened.