The All Blacks' discipline continues to be an issue even in games like this one where they are in complete control.
They conceded 11 penalties to Namibia's seven, as well as seeing de Groot given a red card for a high shot.
Namibia left slightly worse off than the 71-9 margin when these sides met in the last World Cup.
The crowd were on their feet to applaud Malan as he raised a fist from his stretcher on the way off, defiant amid disaster.
Reporting by Lawrence White and Nick Mulvenney, editing by Pritha SarkarOur Standards: The Thomson Reuters Trust Principles.
Persons:
Stephane Mahe, de Groot, McKenzie, Namibia's Malan, Cam Roigard, Flyhalf Damian McKenzie, Ethan de Groot, I'm, Allister Coetzee, Winger Caleb Clark, Samisoni Taukei'aho, Ofa Tuungafasi, Beauden Barrett, Swanepoel, bayed, Namibia Le Roux Malan, Coetzee, Malan, Lawrence White, Nick Mulvenney, Pritha Sarkar
Organizations:
Rugby Union, Rugby, de Toulouse, Blacks, Leicester Fainga'anuku, New, Italy, Uruguay, Thomson
Locations:
Zealand, Namibia, Toulouse, France, TOULOUSE, New Zealand