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A Kiwi Reddit user answered an American woman's plea for help after the woman saw her fiancee in Dunedin having an epileptic seizure while online.
Anna Messner who was in Oakridge, Tennessee, said she felt helpless watching Skype as Melody Madill became unwell.
"The entire time I was terrified, I've never felt that terrified before. Sitting there watching her lips turn blue, frothing from the mouth, and twitching violently was the worst moment of my life."
She is keen to thank her partner's saviour in person to express how thankful she is.
"It was amazing, I'm so grateful. She's literally saved my fiancee's life."
Miss Messner's brother, David Neal, frantically searched for a way to get help.
"I tried calling 911, about the time I said she was in New Zealand that was the extent that they said they could help, but they did wish me good luck," he said.
He then went on the internet for help, before a Kiwi using an online forum came to his aid.
"I went on Facebook, I looked all over for a go-between, and then I went on the New Zealand sub-Reddit and someone offered to help."
Mr Neal and his sister were able to talk to paramedics once they arrived to assist Miss Madill through the still-open Skype conversation.
Miss Messner said she and Miss Madill have been dating for 18 months after meeting online.
She said she hoped to move to New Zealand soon so they could get married.