Teppic meets Ephebian philosophers who are trying to prove that a tortoise can outrun an arrow. I understand this is because the tortoise moves, so when the arrow gets to where the tortoise was, it has moved on.
Then there is this bit:
"On the way to the tavern Xeno had explained to him, for example, why it was logically impossible to fall out of a tree."
Please can someone tell me what he is telling Teppic? How is it logically impossible to fall out of a tree? Does he mean that by the time you reach the ground, the Earth has moved?
(Sorry if I've used the wrong words here, Orcs are not strong on philosophy.)