Tire report said the first skins were down to 10% on Nico's car .

It's not unreasonable to estimate that Lewis's tires would be under more strain , given he was in Nico's wake for most of the race .

So , if it was marginal at all , and they had the time , then it is reasonable to pit both .

If Lewis was able to stay close on times to Nico , then it could have been reasonable for him to wait a few , and then pit , so his tires would be more significantly fresher for the last few laps .
But , his idea was to go to the end .

That was another 20 laps .