I always had to tell softball pitchers to back up somewhere (pitchers usually need to be told everything) because, I'd say, 'no runner ever runs to the mound'. Would it have been better had he covered 3rd earlier? Well, as things turned out, no, but that was half luck, half skill so, yeah. My point was that it's not a normal play (although it may become more of one in the shift era) and therefore not something pitchers are likely to expect and/or anticipate.