They’d obviously agreed strategy beforehand, in order to make sure of a 1-2. The lead driver pretty much always gets first dibs on pit stops, but on this occasion they pitted Lando first, on the optimum strategy, to cover off Verstappen (which they had to do). That disadvantaged Piastri massively, and he’d built and maintained a good lead to that point. So it was the right, if difficult, call to swap the positions back once they were safe again. The team always comes first.
I’m afraid Lando has gone quite rapidly from enthusiastic, bubbly young man to entitled ego. That was very much evidenced in his chat with Lewis in the cool down room. It’s not just me that thinks it either. Great driver, but the ‘son of a multi millionaire’ bit is coming to the fore now. Hopefully Oscar won’t go the same way.