From the sooty exhaust trails it looks as if the aircraft were pushing the throttle up as they broke. The furthest aircraft away in those photos looks to have moved ahead of the next furthest, which seems to be the accident aircraft. At low fuel mass (end of sortie...) the acceleration would be massive even in dry power so it would be very easy to pull in front if 'leading' with throttle instead of manoeuvre when actioning the break. It would be interesting to know whether the Typhoon FCS should be able to cope with jet wash (well, jet blast at that distance) at such close quarters, or would the disturbance send the system into convulsions?