I am guessing that they expected a blowout. As someone with lots of experiences in a student section, it makes sense to me. It’s tougher to be loud when you’re struggling against what you perceive to be an inferior team.
Also, the reffing probably took the crowd out of it. Lots of stoppage in action. There also were no real runs. The largest lead of the game was 5. I think the biggest “run” that happened was a late 9-2 run for Michigan to break open the final big lead.