Betta Fish fighting!! Ur opinion?

My two brothers both have betta fish and they are in separate bowls. Well they put the bowls close to each other (both males) and they flared their gills out and started bumping into the sides of the bowl trying to kill the other fish!! LOL! It was great to watch but then I pulled the bowls away from each other. They weren't eating their food!
What do you think of this?
 
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