Barik's primary shot is joke from far away, use this to your advantage and force the Barik to either stay in place and try to wait for help or go after you. Be ready for both of these options.
If a Torvald is looking at one of their allies, they are probably going to give them a shield, take advantage of this moment via moves that require Torvald's attention to dodge (e.g Makoa hook, Damba reload etc).
Nullify makes BK completely useless. For talents if you know the how good the enemy BK is (from previous matches), BK is the only dmg or your other talents would be useless in the match pick the Direct Current talent to make it harder for BK.