A253: "Brutal" wirkt sich nur auf den Weapon Damage aus - also die 2W6.
A254: Auch wenn's im Compendium nicht bei "Ready an action" explizit drin steht, würde ich es analog zur Delay Action behandeln: Jeder Effekt, der dem Charakter und seinen Verbündeten einen Vorteil bringt, endet in diesem Fall einfach:
"End of Turn: The end of the creature’s turn gets split in two: One part occurs when the creature delays, and the second part when it later takes its delayed turn. Different things occur at each of those times.
End of Turn when the Creature Delays: At the moment the creature delays, any effect that it has been sustaining ends. In addition, effects that last until the end of the creature’s turn now end if they are beneficial to it and its allies—they cannot be prolonged by delaying. For instance, if the creature stunned an enemy until the end of its next turn, the stunned condition ends as soon as the creature delays."