Their friends, having come to their rescue, find themselves in a bind. So it's a matter of course for Xeshanth and Onwym to do everything they can to help. Unfortunately, their power to do so is limited.

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Xeshanth: Move to N19. Use Reveal Weakness again to give a -1 AC penalty to the monster.
Onwym: Move to P19 and fire. (1d20-3)[0] (this includes -4 for firing in a melee, and the monster gets a bonus to AC for cover, as well...) damage (1d6)[5]