Board Thread:Speculation House/@comment-13524376-20130731194144/@comment-5130342-20130801115343

It could also be that Moonslice requires possibly two things : an "activator" chant (possibly why he needed Blake to "buy him some time"), and a possible external energy source for activation. It's possible for Adam to activate Moonslice on his own, but doing so will drain his energy and leave him vulnerable, whereas absorbing energy thrown at him - be it the kinetic force of a weapon slamming into him at high speed and power, or an energy burst like what the spider droid blasted at him - allows him to activate it without harm to himself.