[@vancexentan]

The idea is that he literally steals the idea. It's a Noble Phantasm so I feel it is supposed to be a major game changer, in this case rather than going for the usual instant kill NPs that Assassins have I went for something that changes the course of a battle in a completely different way. In this case, Arsene can steal the skill, as in the enemy no longer owns the skill and instead Arsene has it. Yes it's a fairly powerful NP, but it's also his only NP so I feel like it's a fair trade.