Prevention is the only thing that can be reliably used against Torvald. Just keep your distance from him and you will be fine.

you can counter trovald's ult

If you play with zhin, it is advisable not to approach more than 20 feet from torvald, the greatest weakness that zhin can have is to be annulled and unable to escape.

Torv is a great counter to flanks, especially ability-dependent ones. To be safe against Zhin stay in the backline with damages and healers, and chip away his health. the second Zhin tries to leave, ~1/2 health, just nullify. he'll be a sitting duck.