Hunt re-rolls

[redsimon]

How many hunt-re-rolls are possible? With the Witch-King, Lord of the Nazgûl, you can have a lot more than 5 re-roll options.
The rules don't state how many re-rolls you are allowed to use. It shows no proper example and does not forbid the re-roll of a (failed) re-roll. So my question:
Are you allowed to re-roll a hunt-die more than once?

[Krieghund]

Each die may only be rerolled once, whether it is a combat or Hunt die. If you have more rerolls than dice, the extras are wasted.

[redsimon]

I thought the same, but where is it written in the rules?

[Krieghund]

It is implied at the top of page 20.

the Shadow player can, after the Hunt roll, re-roll one failed Hunt Roll die for each of the above conditions that apply.

This says that you can re-roll a "Hunt Roll die", implying that you are re-rolling a die originally rolled for the Hunt, not one that has been re-rolled already (a "Re-roll die").