Conversation so far:
What is the Human Bullet?
John Maulbetsch
Are there any other interesting aspects about this John Maulbetsch article besides the Human Bullet?
John Maulbetsch won several nicknames based on his size, running style, and fighting spirit, including Human Bullet, the Human Shrapnel, the Featherweight Fullback, the Michigan Cannon Ball, and German bullet.
When was John Maulbetsch given this nickname Human Bullet?
What team was John Maulbetsch playing on when given the nickname Human Bullet?
University of Michigan Wolverines
Where there any notable games during John Maulbetsch's time at Michigan?
John Maulbetsch's breakthrough came on October 31, 1914, in front of 30,000 fans at Harvard. The game was one of the most anticipated matches of the year.

Question: What features made him the Human bullet?
Self-contained rewrite: What features made John Maulbetsch the Human bullet?