We know that everyone was told not to go through the columns a second time, we don't know if anyone ever did and what happened to them I don't think. Could people have done this before and seen the future or was this an only Avendhdie thing? I suspect that it could have been done before but anyone who discovered it didn't want to admit they went through the columns twice...or the future was so terrible (maybe they saw what Ave did) that they couldn't handle it? Thoughts?