unless the bird had suicidal tendencies its difficult to see why it would fly "AT" the tail rotor directly
Hence my comment about closing angles. If the bird was on a set course and the 139 intercepted that course, the first thing the bird would know was a bit of a headache; the 139 wasn't in the hover, it was accelerating on climb.
That's assuming, of course, that the bird wasn't paying attention: but the history of aircraft vs bird incidents is littered with cases where the bird appeared not to notice the aircraft until 'too late'.