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At no point was Lando fully ahead of Max so the overtake wasn't completed so that means he was defending.Not if Max is seen as the attacker (IE Norris was deemed in 3rd) as they entered the corner/braking zone.
I think Max was the attacker in this situation after losing the place on the straight. He tried to get it back by dive bombing, braking late and overshooting the corner/forcing Norris off.