Zoro goes in for a serious attack. He shouts so he is psyching himself up. Tashigi blocks him casually, with the context that Tashigi doesn't want to fight, while Zoro is pressed and needs to push on. Zoro would've gone for a named attack. Tashigi stops his full-forced assault
And Zoro can't do this, stopping the momentum of a cannon ball with a straight arm mid air, which amounts to her using only her hand strength to stop the cannon balls momentum. She does it with the tip of her sword, so it's all hand strength. That's the only thing that she uses for leverage here