Heard via via so take with a grain/bucket of salt... I don't know anything about Airbus systems so it can be complete bull as well but since it's the rumour forum...
Trainee being PF, could not get nose lifted after touch to proceed with the go, sidestick not responsive or something like that. Captain takes control, lifts off with trim input, due to slow change of pitch, aircraft nearly overspeeds, thrust is reduced, aircraft makes a hard touch down, lifts off again. Both engines fail for whatever reason (story said both caught fire), immediate turn around and landing supposedly in glide pretty much, touching around 50m before threshold.
Not sure about the speed at which they couldn't get the nose up by sidestick, supposedly around or between Vr/V1.