Let's recap, SP1 description:
Inflict a Debuff determined by the last Light or Medium Attack thrown. If fighting a Mutant, or if Apocalypse has 4 Genetic Code, trigger both.
Light Attack - Inflict a non-stacking Weakness reducing Attack Rating by 25% for 25 seconds.
Medium Attack - Inflict a non-stacking Poison dealing 5872 Direct Damage and reduce health recovery by 30% over 25 seconds.
As you can see in this video, he has 3 genetic codes and last attack thrown was a medium. This dud placed weakness on my beauty tigra! This isn't the right debuff!!! Right?

Am I missing something?
https://www.youtube.com/watch?v=o5Ri-22lU_E