I had two spam edits from the same user in a short interval: on this contribution and and this one (which I rolled back). Despite his reputation he (or she) seems to be a rather difficult user (I remember he has been blocked on at least one stackexchange site in the past and I had "bump ins" with him in the past as well). Is there a way to protect/block/etc. myself from such a user? If not what else should I do, what would be appropriate?