They must have felt Artemis tacked too close (guessing) and since the boats have difficultly dumping the main Groupe Edmond did everything they could to avoid and couldn't therefore Artemis shoulders the blame and why GE signaled protest. If you choose Suicide port it pays to think a few moves ahead and even then it just goes bad.
After watching it a few times, it looks like Groupe Edmond did actually try to react pretty quickly when it was apparent that Artemis wasn't getting through that tack quickly (looks like they tacked into a header). Boy, those X40s do not maneuver well to leeward when the breeze is up. You can see the leeward rudder stalled on Edmond early in the bareaway (well before the hull was even flying).
