Not beyond the realms of possibility that the dive was an instinctive reaction to the onset of something ominous. The driver sticking it towards the ground in an attempt to land on possibly? Whilst the wing would have seen the dive, he probably wouldn't have noticed high vibration or other indications being given to the crew. I just hope that there are significant data gathering devices in the Tiger. I'm forever shucked how rotary seems to get away with a real lack of black boxes.
I hope they didn't suffer. Rest in peace.