Regular, no orbs Sarda (presumably the version being used here if the "no temporary power-ups" rule is still in place) is not that durable. Black Mage had enough firepower to kill him. ...I mean, Black Mage himself had a temporary power-up at the time, but still.
The issue is actually hitting Sarda, but even Bikke managed that, because Sarda just wasn't expecting anyone to try beaning him with an elemental orb. <_<
Dunno who wins here, but Sarda's not as dominant as people tend to assume.
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"The courtroom is the garden of holy judgment. Those with lechery in their hearts should leave this sanctuary at once!" ~Franziska von Karma