I'm slightly confused here, not least because I haven't received any real warning, and I don't know what exactly I might have done. I have tried to discover which part of WP:HA I have contravened; it certainly wasn't my intention to harrass anyone. I wasn't offensive (at least, I hope not); my purpose was not to make Stho002 (or anyone else) "feel threatened or intimidated". I only returned to Stho002's talk page because he made an offer of a paper which would be very useful for resolving the issues at Munididae; as soon as it became clear that that wouldn't be forthcoming, I walked away. I didn't crow, because I genuinely think it's a shame when a knowledgeable contributor gets blocked. I can only assume that this is to do with the comments above about his admin actions on Wikispecies (which were made publicly, but were not "calculated to be noticed by the target"). I didn't make any personal attacks; I only made some observations in the context of a previous dispute he had with another editor, and that only because I was asked to comment on the article in question. I'll gladly apologise for anything I might have done, but without understanding the block, I can't really appeal against it.