You may come up against a fellow-shouter and then it's just a battle of nerves: who is going to give way?

你可能会遇到另一个声音超大的人，那么这就是比胆量了：看看谁会让步？

And I think what we're seeing now is there's a battle of nerves going on in both parties where both sides are being urged to hold their nerve.

我认为我们现在看到的是双方正在进行一场紧张的战斗， 双方都被敦促保持冷静。