This Team France video shows them training in Lorient, France with their AC45x test boat. I don’t think they were in real danger of capsizing, but the gybe at 40 seconds into the video did not go right! Of course, we’ve seen footage of all the teams splashing down as they work to master their manoeuvres. Click the photo to watch the video.
At about 40 seconds into the video they start a gybe but the boat starts to heel too much. They make a quick recovery and the boat splashes down off its foils.
Notice the camber in the wing and the angle of the horizon.
All the camber is released and the horizon is at a less scary angle.