I understand no crush-through weapons but no knockdown of any kind?
Isnt the point of a 5v5 duel is to focus on teamwork... e.g. if a teammate gets knocked down the another team member would go and help them out?
There are banned weapons because they stun, but you may use all other blunt weapons. But if you win a round by killing knocked down people, the round doesn't count.
And yes, it's all about teamwork. Staying in close 5v5 fights, but hitting people lying on the ground is not allowed.