Very interesting: he performed a Haka, which for those who may not have heard of it before is a traditional war dance of the Maori of New Zealand, but I've seen variations from other South Pacific cultures.
The New Zealand soccer team the All Blacks traditionally perform a Haka before games, and I believe that even though there are non-Maori members, it is okayed by the New Zealand Maori community. Maybe one of our New Zealand GTer's could expand on that. Here's a sample of one of their Hakas.
ETA: a couple of New Zealanders have corrected this ignorant Canuck. The All Blacks play RUGBY! RUGBY! NOT SOCCER! :)