Mac, being a classy person who conducts himself well both in loss and gain, reacts to the defeat of the photocopier by picking up another soda and hurling it at the carcass, shouting "boom! That's what you get, you get faced!" at it and doing a little victory punch into the air. He's already mostly recovered from the shock of watching her slam her foot through it and then beat it against the wall, largely because both of those events worked out in his favor, which make them much easier to integrate into his idea of how the world works.

And he gives Nora a look of vague, bewildered offense that lacks self-preservation. "What was what about?"

He's certainly not about to apologize for nearly throwing her under the bus, nor really thank her for doing the lion's share of defeating their ridiculous foe. He did the soda thing, which was basically all the work, so really, she should be thanking him instead of marming at him the way she is.