Incident at DUB

http://travel.aol.co.uk/2013/02/24/flight-controllers-tell-ryanair-they-have-just-screwed-everythi/

"The Irish Aviation Authority is investigating an incident at Dublin Airport on February 15 where an aircraft that landed and was cleared to vacate the runway, completed a 180 degree turn back down the runway. There were other aircraft on approach to land on this runway, which were being monitored by air traffic control and as the other aircraft was still on the runway these aircraft were instructed to perform a missed approach."
Ryanair confirmed that it was aware of the incident and was cooperating with enquiries.

Very strange When landing on Runway 28 there are two other taxiways which could have been and are normally used before reaching B7, these areE6(Rapid Exit Taxiway) and E7, ok if they missed these taxi ways for whatever reason , i cannot understand why a 180 degree turn was made and even more confusing back tracking down an active runway without permission (it seems) , simple exit onto B7 or even better just listen to ATC/Tower.. they are pretty useful

I cannot wait to hear why this happened.