I like the idea of turning Holmgang into a Marauder's version of Provoke, but not every enemy (bosses mainly) is susceptible to Bind. That might lead to a limitation in that you've bound yourself in place, and in the same skill, provoked the enemy, but it can still move and get away from you, thus wasting your provoke.

I would also assume that the pull of the chain from Holmgang is the same as knock-back, meaning that some enemies will also be immune to it as well.

My suggestion is therefore to remove the 'Can't Die' aspect from Holmgang and create a new Skill for that. Then you could extend the range of the pull of Holmgang's Chain and give it the effect of Provoke. In the event of an enemy being immune to knock-back, and therefore also presumably the pull, make it so that you use the chain to pull yourself to the enemy, like a gap closing skill akin to Monk's Shoulder Tackle.

Beyond two bosses I can think of (WP Flan Boss when it targets a random party member, and Brayflox HM Vangob's charge), the bind/self-bind aspect is pretty useless, so could be removed.