Hello, I posted it just before the forum upgrading so I post it again, sorry for those who already read it, and sorry again for my bad english.
Once again, I searched and found nothing about it.
While you're casting your hearstone, if an ennemy is near you ( opposite faction for exemple ), you can cast an instant cast just before you to be teleported, just spamming the spell.
When you'll be tp, the ennemy will be hit, and you'll be in combat, but far away [ in shattrath maybe]
Have fun