battle1.gif Left click that person with alt pressed down. Then, press 1:1 battle in the menu which pops up. The duel will start when the other user approved the duel.
battle2.gif You can also duel through typing /fight [username], or typing /confront [username]. You can duel characters at level 10 and above. There is no experience or SPI loss due to battle, only reputation loss and gain.
battle3.gif It takes 5 seconds to start a duel.

Source: AirRivals Official Homepage

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