It's a rather new type and perhaps some issues arose that required pilot to do a specific procedure, ,..we can't know anything at this time.
but, believe me they would never take a non-conservative action,...this may amount to something very routine,...they have the best guys in the world writing their procedures,...and sometimes what seems scary or like an 'emergency' to a passenger is a routine protocol for a specific airplane or airline,..also the towing MAY be because it's a 380 million dollar airplane,...I'd pay for a tow myself
PA