Be advised that pressing 'b' detonates all detpacks in the vicinity. So when you are standing at a safe distance, ready to blow the detpac, make sure you are not standing rack that has a detpac on it, for it will blow as well. Happened to me once I only saw the energy cubes (which I didn't need since I was maxed out). I must say that Silencers make great human torches though.