You can force the other tank to go flying by making sure that your hate level is above theirs. Hate itself appears to be determined as a shared value of the two legs/manipulator itself. Once I picked this up I've been able to stop myself from ever getting picked to go into quarantine by going balls out with my opener. Mostly because I'm a jerk who hates being interrupted mid combo or during berserk, I'll force the other guy to deal with it.
Edit: Just to clarify, I never touch the other leg until the one I'm on is down. you definitely do not need to have threat on both legs.
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