Studying The Blade- The SAM DPS Guide

[Allyrion]

1. WAR and NIN both have slashing debuff in their first combo.
2. Slashing debuff only affects the first hit of Higanbana.

1) I don't mean if a WAR/NIN is in the party, Dervy's early rotation said to do it regardless.
2) That might explain it but I was under the assumption that DoTs snapshot the debuff as a buff to the damage like Vulnerability. I know even Dervy thought this at some point, unless something changed or theorycrafters realized it wasn't true.

It seems reasonable if it is true that the DoT portion of Higanbana is unaffected by the slashing debuff.