It's supposed to be only when he starts taunt and when he takes dmg while taunting. Not sure if it still happens now but I've seen STH get buff blocked and still try to taunt and even though he didn't get the taunt buff his allies would still get TM when damaged.
Hmmm. Thanks for the reply. I was wondering about the feasibility of running him in an all Sith zMaul led squad. If he grants TM without taunt, then he'd be the only non stealth ally to target, thus buffing TM for all of your Sith. Wouldn't even matter if he's slow as a ****. Heh.
If he taunts while under buff immunity, he still gives TM to others when damaged, even though his taunt doesn't trigger. Because the TM gain isn't a buff, it's a positive status effect.
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Nope it's passive. No dmg required.
His unique has two tmr chances, once on his turn, and again whenever he is damaged.