Time Back on Clock

[LepTalBldgs]

Many times the rules make sense to me, but other times not. I'm trying to figure out a way to remember the ones that don't make sense, and this one doesn't.

Can you explain why you wouldn't put time back on the clock of we're going to shoot the second with players on the line. I understand that in citing 2-10 the rule says you shouldn't put time back on.

My question is why.