Battle takes place in an Abandoned(Yet not derelict) Skyscraper.
Both teams know of the other's presence, but not of their skills and weaponry.
Each Archer carries their bow and a quiver with Fifty arrows of various types(such as the boxing glove arrow) Kate also carries her staves to counteract Oliver and Roy's weight and strength advantages.
Fight continues until the other team is Incapacitated, whether it be by knockout or death.
(@the_stegman: Let's say Ultimate, simply Because I think he's more badass.)