I am really struggling to understand a passage of a book called Ohnehin by Doron Rabinovici. The sentence goes:
Im Spital hatte er von seinen Plänen zu sprechen gewußt, noch während er sie entwarf, und so hatte er sich vor Professor Kahlbauer heiß geredet, doch nun schienen ihm seine Gedanken abgestanden.
I really can’t figure out what is meant by “so hatte er sich vor Professor Kahlbauer heiß geredet.” Should I look for sich heißreden? I cannot find anything!
I guess it means that he was very agitated while talking before the professor … Is that right? The rest of the sentence is clear: “In the hospital he had been able to talk about his ideas, while he was still developing them … Now though his thought seemed ‘flat’ (not interesting, maybe?).”