Did Piastri's mistake cost Norris half a second in qualifying?

Lando Norris finished ninth in qualifying for the Italian Grand Prix at Monza, with his best lap of 1m22.256s recorded on his first Q3 attempt. He believes he could have gone around half a second faster on his final run had team-mate Oscar Piastri successfully provided him with a tow as planned, but Piastri made a mistake that left Norris effectively first on the road in the closing stages. The incident may have cost the defending Formula 1 world champion several grid positions.