User blog comment:BadDesperado/"Swain's" Duel Against Keiram Darkwill/@comment-31656015-20130510090418

It's definitely possible that Swain didn't want to reveal his "true powers" given his character it's plausible that the full extent of his ability or the "ace up his sleeve" is something he has no intention of revealing.

Swain and Leblanc were both members of the black rose. and swain's rise to a position of power might just be the bud that will bloom to the true blossom of the black rose so Leblanc would have willingly helped under those conditions.