Well, I don't use H5 so dunno how works dat doSimultaneousCast.. So, try like that. Make the skill toogle and change it to activeChar.doCast(offensiveSkill); - Interlude way :D
Also, from my pov dat looks kinda weird
activeChar.stopSkillEffects(26074);
L2Skill offensiveSkill = SkillTable.getInstance().getInfo(26074, 1);
Stop and launch ? :-\
I mean, shouldn't dat stopSkillEffects from defense if active and then launch offensive? I think dat was supposed to be.. Or try to delete dat line about stopSkillEffects and see if this cause the problem or not.
Or make it like that
L2Skill offensiveSkill = SkillTable.getInstance().getInfo(26074, 1);
activeChar.doSimultaneousCast(offensiveSkill);
to
L2Skill offensive;
offensive = SkillTable.getInstance().getInfo(26074, 1);
offensive.getEffects(activeChar, activeChar);
Some advices how I would do that, I guess.. :P