Odd. I've noticed the animations on my Archer. The bloodletter not going off right after a GDC was noticed. Instead of trying to force it to work that way I looked through my skills.

The Lancer Fient skill uses a normal auto attack animation. The 20% slowdown for 10s isn't shabby either. I found out by using bloodletter and then tapping fient both go off in a quickfire succession. Doubleshot anyone? =D