Dammit, I thought we were gonna discuss the lore about what happened to Doomguy between Dooms I and II.
I was gonna say he buried Daisy's head after setting fire to the big curvy structure that housed Dis/Unto The Cruel (depending on what you think is canon there), then he dropped all his weapons except for his trusty pistol (it's the only weapon that was truly his, after all), thinking that his part in the war is over - then he jumped the fence of the first building he saw, walked past the chainsaw without noticing it somehow, and went into the entryway....