Removal of a Science Refdesk query 

Hi, Ten. I just spent about an hour composing a detailed reply to a seemingly unexceptionable Science Refdesk query about frogs and toads (which had already had one routine but brief answer from regular contributor Kainaw), only to find that when I Save Paged, the whole question disappeared. As far as I can tell from History (which I'm not very conversant with so forgive me if I'm mistaken) you were 'reverting a banned user.' I'm sure you had a good reason for the action, but for my own curiosity:
was the banned user the OP?
can you link me to the reason for the ban?
what tipped you off given the innocuousness of the query, and
is there a handy list of banned users I should check before answering apparently innocent queries to avoid future wastes of time? 87.81.230.195