Dextolen says:
Example: MAT 24
Roll 2d20
After the post appears, pick which goes to the CTN 20 and the CTN 4
If the first roll is a 20 = fumble.
If either roll is a 1, pick which target it's applied to
More like "rolls 1d20 twice" because if you roll "2d20", you'll get a result between 2 and 40... :P
But yeah, otherwise, it's more or less what I was expecting might happen... It's going to be a bit annoying to type all of that, but hey, technology still has its restrictions... :P