Guro Lonely Dog explains
"The "Beasting" is an initiation tradition taken from the UK Training Groups. If a Dog Brother Tribe member wishes to become a DBMA Group Leader he/she has the choice to undertake a "Beasting". The initiate has to fight continuously for 8-12 mins, every minute facing a different (and fresh) Dog Brother (aka 'a Beast'). The Beasting is totally voluntary, and is not required to become a GL, but is done by those who want the Kudos...
"You don't go into a Beasting to win, but to survive. The 'Beast line' should be composed of fighter who are your peers or better. Any one of them has the capacity to end your day.The purpose is to push rather than break, after 3 or 4 minutes the initiate is usually exhausted and battered. At this point it's all about balls and determination."