"If you know the enemy and know yourself, you need not fear the result of a hundred battles"
~~~
The success of Tristan's plan wasn't just because of his Blood Seal ability. No, there was much thought he put into it in order to make sure the steps were going accordingly.
He knew beforehand that the barbarians who would attack the fort came from three different tribes. What made this information very crucial was another piece of information that came with it.
From Astrid, Tristan came to know that the barbarians were often waging war with each other in their own home, which meant it wouldn't be too unusual if these warriors suddenly changed their target from the enemy to the other tribes amidst the battle.
With this intel which made him as if he was all-knowing, Tristan managed to come up with a plan that would have these three tribes attack each other instead of focusing on the orcs.
