Someone I know quite well nearly bled out from a tonsillectomy. Doctors had to cauterize the wound to stop the bleeding and in the process touched what basically was a glorified soldering iron to this person’s lower lip. Left one hell of a brand.
Your poor friend...but afaik, a post-operatic haemorrage after a tonsillectomy is still something which carries a significant risk.
I remember that there had been two deaths in Austria in the early 2000s due to complications from tonsillectomy. There were reports in the media then.
And may God rest the soul of the victim.