RRS 60.2(a)(1) If the protestor is a boat, she shall hail 'Protest' and, if her length is more than 6 meters, conspicuously display a red flag, at the first reasonable opportunity for each.  She shall display the red flag until she is no longer racing.  

As a protestor you are required to hail protest and also required to display a red flag if applicable as read above, deviation from these requirements can/should render any subsequent protest as invalid unless subject to other parts of RRS 60.  

I think if contact occurs then the right of way boat necessarily needed to take action to avoid any the give way boat will always break a right of way rule.

And I appreciate it.

I never called you a blockhead.

Thomas ..
  Both Case 77 and Case 91 when taken together imply your answer I think.   Both pertain to the obligations of a keep clear boat when  the equipment of the ROW boat is out of its normal position. 

A boom swinging from the starboard to port side is a boom operating in its normal operating positions.   A KC boat sailing DDW so close along side a ROW boat that if the ROW boat flops her boom over, without ROW changing course, that the boom hits part of the KC boat .. the KC boat has not kept clear IMO.  

In other words, a ROW boat that has to prevent their boom from moving fully to the port side to avoid contact with a KC boat has executed "an avoiding action" IMO.  

I think this is affirmed in the negative when you read the cases I linked to above.  In those cases they discuss the obligations of a KC boat when equipment is or moves out of its normal location.  

IMO, unless there is a case that says otherwise, there should be nothing unexpected about a boat sailing DDW on port-tack flopping her main over such that she is sailing on starboard-tack. A KC should be keeping enough space between them to allow that.