Kendo freaked me out

The 1st time I heard Kendo, the 1st impression is, it's a sports like karate but using a bamboo stick. BUT, when I went to watch the Kendo, the definition becomes, it's a scary sports.

Why scary?
Because the keep shouting and hitting people's head! I watched the training, the training was like, many pairs fighting with each other. So the shouting was so loud, scary and looks like violation.

This video is good enough, not that scary, because it's a game, not training:



I'll show u the one I watched in the training some other time ^^