[GAMEPLAY] Announcement glitch when killing blood moon herald

Hello, I was playing the amazing game mode 'Blood moon' and we slain the demon herald, and the announcement was displayed with a nice blue square and the text after that was something crazy not normal but it happen so fast I couldn't screen shot it in time. some of the text was "demon_herald_unknownchat_announcement". I hope this helps.

Im not sure how to reproduce this, without killing it over and over.