Aside from that, he also prepares to use his Time-Turner to “flee upon an instant’s notice”; furthermore, after the starlight spell wears off, Harry’s first thought is to guard against an attack from the Defense Professor while Harry is temporarily blinded.
I thought that he just didn’t want to talk to Quirrell at the time and wanted to continue his walk alone for another hour.
Aside from that, he also prepares to use his Time-Turner to “flee upon an instant’s notice”; furthermore, after the starlight spell wears off, Harry’s first thought is to guard against an attack from the Defense Professor while Harry is temporarily blinded.