1. Know the mechanics of the [Talent] you're trying to improvise.  If
   you can't be troubled to look them up, propose something and the [GM] will
   slap a [Circle] label on it.  I'll be guessing high. >:)

2. Figure out what the closest you can come is.

3. Spend at least one point of [Karma] and concentrate for a second.
   More, if this is particularly hard, or if you're missing [Circle]
   prereqs (e.g. a first [Circle] character improvising a third [Circle]
   [Talent]).  Don't expect me to be consistent unless you've formalized
   it.

4. Roll against that "closest" skill.  You have a penalty of -3 per
   [Circle] you're missing, and -1 per prerequisite [Talent] you're
   missing (e.g. Woodskin is a prereq for Stoneskin).

5. If it succeeded, describe what this looks like.  Include the fact
   that your [Karma] is visually manifesting.  For example, glowing
   trails on arrows from an Improvised Missile Weapons.

If you're trying to improvise things which need to be instant, like
Avoid Blow, do the concentrate-and-burn-Karma thing ahead of time,
then dive into combat.  No, it's not as useful as having avoid blow.
[Eit].

The [Karma] you spend in (3) doesn't count for the roll, and this isn't
a [Talent] (yet) so you can't spend extra [Karma] on it.