How thorns (dual blader) works

Also thorns will not stack se, some guy from KMST tested it and he put in youtube and said thorns doesnt seem to increase dmg. If SE stacks with thorns? That would make other classes far too powerful and it wont make sense. Anyways rather than worrying it now. Lets just wait and see. In end you will see that thorns does not stack with se. I believe in my own opinion and it won't change unless someone really shows that it does stack.

Mind linking to that video?