It does mention it in the ability description ("While channeling Last Stand you are have greatly increased bullet and spirit resist."), but in the stats section (below the DPS number) it still only mentions +50% bullet resist. It does apply +50% spirit resist on cast so this is only a visual bug.
Also there is a typo in the last sentence of the ability: "While channeling Last Stand you are have greatly increased bullet and spirit resist."
Also there is a typo in the last sentence of the ability: "While channeling Last Stand you are have greatly increased bullet and spirit resist."