Ah, okay. I thought the spell resistance check is the free one (which he wouldn't have passed since he would have had to exceed 5 scores) and all others (against 3 hits) are Complex actions. If that's wrong, then of course I'll go for the
bambam.
You can choose whether we leave the old roll:
Shoot:
15d6t5 7 15d6t5: 7 [15d6t5=3, 5, 5, 5, 6, 6, 4, 4, 1, 4,
5, 2, 1, 3, 6]
which leaves 5 hits.
Or else, I'll roll a new one:
Shoot:
10d6t5 4Depending on which roll counts, it's either 11P or 10P for the barrier.
The rule your were referring to (CRB 198, penetration weapons) only count if the DV exceeds the Armor rating. Since the DV of the Savalette Guardian with explosive ammo is 3 (which is lower than 4), the rules from CRB 197 apply. Thus, the barrier takes 4 (or, if you count the second roll (from OOC, (11:15:41/12-14-15)) 3 points of damage.
So, in the end, depending on which rolls you count, Yang should suffer 8 (1st roll for aiming, 2nd roll for defending), 7 (both times 1st roll or both times 2nd roll) or 6 points (2nd for aiming, 1st for defending) of damage. These are reduced by both his INI+REA and his Damage resistance test.
Whew, SR is a good training for both lawyers and mathematicians ;-)