Loras moves along the wall and looses a sling bullet at any opponent still standing.

Spoiler
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If there is no-one standing then he just finds somewhere safe to hide

Sling (1d20+7)[11]
Damage (1d4)[1]
Skirmish damage (1d6)[6]
Psionic Shot (2d6)[5]
Critical (1d20+7)[12] 20 only x2
Damage (1d4)[2]