Then accidently trip over Dovahkiin's head.
As well as the heads of all his Stormcloak brothers, since it seems like Ulfric was meant to be the last one to the block. The best time to free your men is usually when they're still alive to enjoy it.

Well, seeing as how the legion actually overthrew him and captured him in the
first place alludes to the fact, that Ulfric may not be as strong in the way of the
voice as he'd like us to believe. He only spent 10 years at Sky Haven Temple,
and that isn't very long for most to learn the dragon language.
Actually he spent no time at all at Skyhaven Temple, since it's been abandoned for who knows how long. Nobody could even get in there until you showed up with your fancy shmancy Dragonborn DNA.

He studied with the Greybeards at High Hrothgar.
He probably only knows Fus Ro Dah and that's it.
Nope, he also knows Disarm and will use it to great effect in the battle of Solitude. At least he always does in my game.
Being on PC I've also taken advantage of modding to take him as a follower on a few adventures. He may know only two Shouts, but I can assure that his Thu'um is plenty strong enough.