It states;
But in actuality;IF either of you has any glory worth mentioning....Under 10% or over 1000% of their GnR you can attack them but 5 x day, and may not sab.
So even though the attacker had above 1000% of their GnR, they were allowed to continue attacking. He was not limited to 12 attacks, just happened to stop at that many.You have attacked this realm 12 times in the last 24 hours. Your glory and reputation is 2903.33333333 % of theirs.
This was pointed out to me by Mass Effect (ID:23345) which he noticed while attacking Teyla (ID: 29138)