You dolt.
The fish you have are probably weak petstore stock that will get ill and keel over after one injury. I personally am opposed to betta fighting, but if you're going to be so cruel, ignorant, and bloodthirsty as to do it, you should at least do it properly, with strong, well-bred stock from someone who specifically breeds strong, healthy fish for fighting. Though honestly, if you're only getting fish to watch them wound or potentially kill one another, you aren't a very fit animal owner.
People like you make me absolutely sick. I recently rescued a betta that some moron like yourself put in with another male in a store for kicks; the one fish was nearly killed it was so wounded, completely unable to escape in the undersized cup, or even properly submit to its opponent. "Domesticated" bettas have finnage that inhibits thier ability to fight or escape efficiently. And unlike in the wild, they can not escape their opponent after a brief dispute because they are confined to a tank. So fighting captive bettas is hardly a natural activity that your betta needs to thrive in captivity. In fact, captive bettas do much better when kept entirely solitary; less stress on them, poor weak things that mass-breeding has made them.
If you like violence so much, go watch the news or attend a hockey game instead of torturing animals.
