After re-reading the README: @vhmth you are totally right - `finish` should be used when we upgrade. 

Parsing the form means that busboy goes through all form data and performs the file upload for the each file that was uploaded (https://github.com/TryGhost/Ghost/pull/1615/files#diff-512aa9eb14440c01606f36a6f3468f65R24). `end` is fired for each file while `finish` signifies the end of processing the form.