Does the AFDS work the same on the 777 as on the 737 for go-arounds? You press TOGA, flight director gives you pitch and roll guidance while thrust levers advance to go-around thrust if A/T were engaged? How about if A/T was not engaged, just flight director pitch guidance and thrust levers stay where they are? As the FO seems to be quick on the PTT reading back go-around instructions, the Cpt. might have been quick putting both hands on the yoke, thrust levers are closed, with nobody checking thrust. Would explain the lack of climb. Must be more to it than just Rolls Royce engines being slow to spool up and high OAT.