So the bit i ommitted was that the journey was one pnr doh cph kef. They are claiming that its a trip greater than 3500km, that began in doh with a less than 4 hr delay, as opposed to just the segment cph kef, which is 2100km and over 3 hrs delay (400eur flat, 3.5 hrs total delay).

Which is the correct way to interpret for eu261?