What I'm leaning towards is the double saber template (3diff die) with 2 setback added cause its unusual.

Idea is its a blade catch on the one side so i was thinking something like "When activating linked may forgo the second hit's dmg to add 2 setback to opponents next roll, if the opponent doesn't attack user dpend a manuever to detangle locked blade."

"Damage from second blade has -3 modifier to and pierce +1