Counter Attack Boost
+general
Delivers a counter attack after a successful block
On a combox2, only the second strike can be countered
On a combox4, only the fourth strike can be countered
You COUNTER probability is =0.1+(0.02 x points invested_in_Counter-Attack-boost)
It means that with a full 10/10 counter-attack-boost you will counter-attack 30 % of the strikes you blocked (excluding the 1st ones of the combos)
Since the highest block rate sheild will block 82 %of the strikes the best counter ratio you can hope for 0,82% x 30% = 24,6% of stikes countered. and this excludes the first strikes of the combos which you can not counter anyhow.
+strategy
Avoid this skill.