She's at her best when 'the heat is on'. [=when she feels a lot of pressure; when she needs to finish something quickly]
She said things in 'the heat of the moment' [=when she was angry for a short period of time] that she later regretted.
The company has 'turned up the heat on' [=has put extra pressure on] its employees to finish the job quickly.
(..) It's blood money. I s-- Jeez. Okay. Yes. All right. I said that. I did. But it was in-- in the heat of the moment. I was trying to win an argument, all right? And I was wrong. This is your money. Come on. (..)2013 TvShow: Breaking Bad Title: Blood Money Season: 5 Episode 9