[His heart is pounding and he's tense, ready to fight if it comes to that after all, but he's not done trying to make her see reason.]

You're so angry because you know I'm right, and don't want to admit to yourself that this is not the best course of action. Putting your pride above your sense is the opposite of what you need to be doing right now.

[Putting it that was is a change of tactics and a huge risk, but he'll either succeed in getting through to her, or see if she's bluffing or not after all.]