Unlike most perciformes, channa have teeth and powerful jaws. They do not have the large but relatively weak mouths like most perciformes such as bass who are forced to capture and swallow prey head first (to avoid getting stuck if their prey is another fish). Channa can afford to take out small chunks of its meal. Saying that, these videos are very unrealistic of how they naturally act. Typically their meals consist of small bite sized fish, inverts, amphibians, etc. They will only attack larger prey under extreme circumstances when they have no other choice.

Oh and I forgot to mention that bowfin are not related to burbot. Bowfin are the sole remaining survivor in its genus. Burbot believe it or not are related to the saltwater Codfish!