Unrelated to space – just sayin'.
http://www.cbsnews.com/8301-503544_162-57367467-5…

If you are flowing (i.e. paying attention to the speaker) then you know what the other team read and didn't read. And just like any debate, paperless or not, if you miss arguments due to lack of attention or flowing skills, it SHOULD be your responsibility to take prep or CX time and ask your opponents.

That being said, if you miss something on the flow, or there is confusion of what was read due to lack of clarity from your opponent, this becomes a strategic decision depending on whether you think the judge was similarly confused, or if again you want to use your own prep or CX to clarify.

Now, I think there is a big difference between skipping a card in a block, or not getting the last thing in a F/L, due to time constraints and then letting your opponents know this when you hand over the paper or jump drive–VERSUS–reading evidence, and excessively hiding this evidence in pages (digital or paper) of unread evidence or answers.

Lastly, I agree with DavidKP ad Scottyp, if a judge is going to run time while teams "mark" unread sections of evidence, this time should be taken from the unfinished card's team, but I don't see this happening often practically. When I see this it is un-timed in that grey area between the speech and CX or it just becomes part of the CX or prep of the team asking where the card should be marked. But again, if you flowed and listened well, you probably wouldn't need to ask.