[Akiyoshi]

^ Yup, that's one of the possible reasons i tought a couple of pages before.

I'm still waiting for context since this fight is clear evidence that:

a) Tohma can effectively shut down the Anti-Magic aspects of his equipement and energy attacks in it's enterity or...

b) Signum found a way to get around that ....or...

c) Laevatein got some internal upgrade(as no noticeable changes are made in it's appearance) that enables him to allow Signum a decent fight against and Eclipse Driver.

I'm almost sure "a" is the answer but i still wait for official confirmation.