Engine number one failure on final approach, select flap 15, set go-around thrust, apply a few degrees pitch up, positive climb, gear up. All perfectly standard so far. One major Hyd pump down, but no worries.
Ooops!! Engine number two running down, pitch down, select gear down, but hang on a minute, no major Hyd power now so it's still not yet even fully retracted, oh well, we're going to land anyway, with the gear wherever it happens to be.
That just about covers it I think. No crashing it on to the runway, simply the gear not where it was meant to be. I hazard a guess the ROD was lower than normal without three greens.
An extremely 'Well done' to the crew involved for getting it on the runway in the configuration with which they were presented.
DV windows open are totally irrelevant.