I'll take a stab at this too.

Let's say an enemy mage, Sue, is Bob with a F5 stun bolt. Both Ace and Bob have declared spell defense for Bob.

- Sue rolls 11 dice for her Magic + Spellcasting + Focus, scoring 4 hits.
- Bob rolls his 3 counterspelling dice, scoring 1 hit.
- Bob then rolls his willpower of 5, plus Ace's 6 counterspelling dice (5,+1 for Bob's hit), scoring 2 and 2 hits respectively for a total of 4.
- With no net hits, the defender wins and the spell fails

Now let's say the enemy mage is using a F5 stun ball. Both Ace and Bob have declared spell defense for Bob.

- Sue rolls 11 dice for her Magic + Spellcasting + Focus, scoring 4 hits.
- Bob rolls 3 dice, scoring 1 hit.
- Bob rolls his 3 counterspelling dice, scoring 1 hit.
- Bob then rolls his willpower of 5, plus Ace's 6 counterspelling dice (5,+1 for Bob's hit), scoring 1 and 2 hits respectively for a total of 3.
- Ace rolls his willpower, 6 dice, and scores 2 hits, which added to the 2 counterspelling hits above total 4 hits.
- Sue fails to effect Ace, but has hit Bob for 5S this time.

What becomes tricky is when area spells get involved and someone tries to spend edge. Are the counterspelling dice rerolled for everyone, or just the person who spent edge? Can anyone spend edge to reroll the counterspelling dice, or just the person who contributed the biggest counterspelling pool?

Eep!