Sep. 9—URBANA — Max Herendeen was one face in a crowd of hundreds in between the 16th green and 17th tee at Hazeltine National Golf Club, but the Illinois sophomore was able to share a quick moment with teammate Jackson Buchanan during the Round of 16 at the U.S. Amateur. Buchanan had just fallen behind 16-year-old Floridian Tyler Mawhinney after a bogey on No. 16 to go one down with two holes …