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.

As Buck, don't engage against tanks- especially Torv. he can outlast recovery (1k vs 2.2k), block leap with nullify, and chip you down. Again you've lost damage from a blocked leap, you lose your escape, you can't heal mid-fight, and he outlasts you.