*anything* rule can only work when you initiating with a contact. You've been an immune carrier for a deadly disease which can infect anyone just with a touch. You blackmail someone and threatens him/her to do anything or else they will suffer which is why you need to initiate contact with the victim first hand. Its all about being the initiator before anything became possible.
yes you very well can though you need to be creative with it like.. for instance a piece of gum you can suffocate some one with a piece of gum how may you ask? put it below there nostrils and cover them leaving no air holes :P
It depends. You could kill someone with words, or you could use an everyday item like a ballpoint pen, and stab it through a persons head. Though, it’s not suggested.