He ran 1:54 in Flag 2 years ago and somewhere it was said that was a 1:51 conversion. I guess that since it was 2 years ago he was not as fully adapted as he is today to 7000 ft. I don't know of any 3:57 miles that cannot run 1:52 let alone at 7000 ft.
And another thing....he just destroyed Sahlman by 6s whom has run 1:46. Do you honestly think Colin Sahlman is 6s faster in the 800 than Nico at this present moment? Do you think Sahlman could even beat Nico in an 800 right now? Nico is a 1:48 guy if not faster.