"There had been an unsuccessful search by the Brazilian Navy, however, Judy, Simon's wife, was insistent that he was okay and it was likely there were some communication issues on board," Mr Willison wrote. "When Simon arrived in Granada he had an incredible story to tell.
After the stroke, he headed towards Brazil to seek medical help. He realised that in Brazil he would be hospitalised and it was likely the boat would disappear.
Mr Willis took "many years" to build his vessel for the trip and losing it in Brazil "was an unthinkable eventuality".
So, Simon headed out to sea to give him more room, and continued towards Granada, Mr Willis recounted.
"Sailing was quite difficult with only half his body working and looking after himself was a huge challenge. However, Simon in his own words 'got on with it like any Kiwi yachtsman'. When he got to Granada horrified friends docked Sagitta and took Simon to hospital.
"The neurologist who saw him suggested a month of extreme occupational therapy was probably the best thing he could have done and it was likely that he would make a full recovery."