How can I kill the infected enemies?

[Googolplex]

OK, but I 've seen a video, where an infected was killed by 24 dynamites.
But in the game is no dynamit.

When I throw a box on it many times, it won't be killed.

The one I can do is running, running, running...

But with 24 dynamites (by cheating? what ever) the infected can be killed.

and what 's that? http://www.youtube.com/watch?v=DLnqUB1BFJc