Why I didn't notice as soon as I started using it is beyond me but anyways... According to the tool tip Inciting Cry (16 point Templar talent) causes a high amount of threat and applies taunt for 6 seconds to all enemies. While running Garai Coliseum today I noticed that its not actually applying 6 second taunt to the mobs but rather just grabbing their attention and then letting go.
I'm also specced in to Deafening Voice so whether its a conflict between the debuff being applied in the taunts place or not I don't know.
While we're on the subject of taunts it might be worth while to take a look at the single target taunt as well. According to its tool tip it causes a high amount of threat applies taunted status for 4 seconds and forces the target to focus on you. Currently I'm specced with 1 point in Resolute making it a 7 second taunt instead of a 4 second when Loaf some how managed to pull the 1st boss in GC off me after applying a fresh taunt to him.
Now to me that tool tip says that while the target is under the effects of the taunted status it should not be focusing on any other player other than myself esp. after it had a fresh taunt applied.