Nope. I don't believe I'm trying to intentionally harm him or his gear in this situation in any way what so ever. I don't see how by merely riding a bike I become obligated to be some sort of safety officer for someone who chooses on their own to tailgate me. If there were expressed consent, where I agreed to the drafting relationship, then I think I would have some sort of responsibility for choosing the path. Without that offer and acceptance, to me it's merely illegal tailgating and the drafter assumes all responsibility.