That's a quite different story and starboard was restricted by rule 16. In normal case with hails starboard would keep its course and then duck, if necessary. That leaves the case open for the starboard or a third party to protest. I can see that port could easily get DSQ on rule 10, but starboard did not break any rule. In most cases port can't do anything at the point she notices that starboard is not willing to duck and thus has to start the cross confident that starboard will duck and doesn't protest.Yes to one of the questions, and partly yes to the other. They are extremely rare.
The protest where the protest against the port boat was dismissed was handled very well by both boats, where the starboard boat made it clear they sailed a course to pass astern in good time and refused to concede they had sharply altered course at the last minute to allow port to cross.
The rule 2 situation never made it to the protest room. Fact Found (approximate recollection) Starboard had hailed "cross" and initially bore away encouraging port to cross and then luffed forcing the port to crash tack to try and avoid collision. Starboard had to luff above chc to avoid Port before port completed the tack. Starboard protested under rule 13 and 15.
Arbitrator (IJ) recommended that if this went to protest: Port would be found to have broken rule 13 but would be exonerated under rule 21 . Starboard would be disqualified or worse for breach of rule 2 and 16. Starboard withdrew the protest.
(History does not record the arbitrator addressing the issue of whether P also broke 10....its academic because S wisely dropped a protest which would have gone very pear shaped for them if they had gone into the room)
Starboard making a protest will not gain more friends and the next time port will leebow without asking, but still I find it hard to see this as a rule 2 case.