ElevatorEleven said: Boomer isn't sloth. Boomer is the one with initiative. His ambush blow leaves the survivors vulnerable to the other infected.
At the cost of then kamikaze himself ie. basically canon fodder...which is a since is what China is. The tackling dummy, so the people inside the mansion won't have to waste time with the common people (ie. anyone who isn't Marisa or Reimu).