"He who runs with aggression, walks without dignity."
A supplementary question which has just occurred to me:
Does the ability to turn a 3 into a 1 count as a re-roll?
No, it does not count as a re-roll.
In other words if I had two abilities, one to re-roll 4s, the other to turn 3s to 1s, and I first rolled a 4 then re-rolled it to get 3. Could I then simply turn the 3 into a 1? I'm assuming not.
Yes, you may count the 3 as a 1.
To summarize: the 4, rerolled to a 3, would become a 1. This is explicitly stated in the example in G3 of the rules.