...they are both smarter than each other (or so they claim), and both have a banshee to fight. Now i'm gonna go leer in the background.
No thankfully we wait in our tanks until the cowards of the Mon'keighs tanks are nothing more than a memory, then we come out at the word of our seers and deliver a beautiful end to those still alive.
A staring contest that lasts unto the end of time. Quite possibly beyond it, presuming Ynnead allows them.
Being Farseers ... who can see the future ... they undergo some rigorous training exercises, such as staring contests with a gyrinx. They make sure to get a good night's rest before the day of the great match. They bring eye drops. And then, being able to forsee all possible outcomes ... neither of them turn up.