I just blew a bonus objective on a Dark Brotherhood daily sacrament quest, because when I snuck behind the target, and attempted to press X for the Blade of Woe, it switched to Vampire Feed and the target "saw" me, and I lost the, "Don't be seen" objective. This is not the first time, while attempting to Blade of Woe that I have accidentally fed on a target instead. These should be separate buttons. It's not fun when you lose something, not to your own error, but to a game flaw. Please change this.