1 Alvissa: Okay, we're all geared up and ready to begin the quest.
2 Alvissa: We head off west towards the Orcrift Mountains.
3 Alvissa: Now what happens?
4 GM: {stunned} I'm at a loss...

A good Gamemaster is prepared for everything. Well, nearly everything. Some things are just so unlikely that there's no point preparing for them.

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2014-05-06 Rerun commentary: If I'd made this theme using LEGO minifigures instead of metal and plastic gaming miniature, they would actually have been able to ride the horses.

LEGO horses are curious beasts. Because a LEGO figure cannot spread its legs apart, the horses have a deep slice taken out of their backs so that the figures can stand inside the horse's torso. If there's a saddle involved, and the character's legs match the colour of the horse, this doesn't look too bad. But when nobody is riding the horse, this gap needs to be filled in with a 1×2 brick and 1×2 plate atop one another, of the same colour as the horse. (Or I suppose you could have them be different colours, giving the horse an unusual bicolouration pattern.)