There is a generalised train of thought to get away from the term "Accident".
In Police circles, the definition RTA (Road Traffic Accident) has now been moved to RTC (Road Traffic Collision).
No-one for one minute will be suggesting that this was a deliberate act. These guys are the cream of the crop of RAF pilots, but due to the nature of their performance, there is always the chance of an incident, particularly in training where new maneouvres are being undertaken and new Reds are being brought on board.
Let's wish the injured pilot a speedy recovery, and hopefully with it being so early in the season, they'll be able to bring in a replacement Red without too much disruption. I assume they'll have a "reserve" pilot for incidents such as this? Will they just go on practising using the Red 10 aircraft now? Can they shuffle a new Hawk from training duties @ Valley or somewhere else as a replacement aircraft?