Is bailing a checked swing?

[Paul L]

My main question is whether PU should (must?) go for help on a checked swing appeal if requested by the defense even though PU does not think there was a swing (an attempt to strike at the pitch) at all. In other words, can there be a checked swing when there is no swing at all? And if there is no checked swing, can the defense make a checked-swing appeal? Should PU refuse to go to his partner and simply say there was no swing to appeal?

By "independent judgment", I meant should BU assume that there was a checked swing if PU asks for help (remember the PU's question was "Did he go?") and simply rule on whether the assumed swing was checked in time. So far, the answer seems to be no, that BU must perceive an attempt to hit the pitch, and not break the question into an initial attempt to hit the pitch and then a successful interruption of that attempt before going too far.