So, earlier today, I was looking over an interest check a friend of mine had made for his Aztec-Fantasy hack of AW on a RPing site we frequent, and noticed that when he listed the result possibilities for every roll made, that he listed the 1-6 result as 2-6. I pointed it out to him, and he said it was supposed to be 2-6, but I pushed on with the knowledge that it was supposed to be 1-6. So, finally, he said that then it would allow for 0s and negative numbers as roll results (something I've never seen in any game I've been in, but still feasibly possible) since one stat has at least -1, there can be debilities that further reduce a stat by -1, and Aid or Interfere allowed for players to add another -1 to said roll. After that, we then got onto the discussion of what to do in the event of a player rolling a 0 or a negative number. He said that he preferred that it counted as a player had gotten a +10 or +12, as a result of failing so bad it worked, while I was more in favor of allowing for players to reroll for said move.
So, what I want to know is, what do you more veteran GMs do in this situation, if it feasibly happens?
-Zed
P.S., Lumpley, if you could give your input on this, it'd be great, seeing as how you're the progenitor of the system.