Rex releases some Bulgarian profanity when he hears Ekkehardt's voice, but it's followed by Hungarian. Bulgarian is the language of Rex's brain. Hungarian, the language his mother spoke to him in, sung to him in, raised him in, that's the language of his heart. Ekkehardt likely has no idea that Rex is exclaiming 'you're alive!' but it continues to come out as a babble of Hungarian, gesticulating as he tries to work out what just happened.
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