His wife, Cecilia Wessels, had no idea what her husband was doing, until her nine-year-old daughter woke her up from her nap, telling her “dad wouldn’t come inside,” according to FOX8.
That was when Cecilia caught a glimpse of her husband mowing the lawn... with a tornado swirling behind him:
"My beast mowing the lawn with a breeze in his hair."
The family moved to Canada from South Africa where tornados are not common, so Cecilia took a photo, not to show her husband cutting the grass, but to capture the large funnel cloud. She told Times Colonist:
"I literally took the picture to show
my mum and dad in South Africa, 'Look there's a tornado,' and now everyone is like, 'Why is your husband mowing the lawn?’”
Theunis was very calm about doing his chore as the twister was building up behind him:
"It looks much closer if you look in the photo, but it was really far away. Well, not really far, far away, but it was far away from us,"
The father did keep his safety in mind while he made his crazy grass cutting move:
"I was keeping an eye on it."
According to Buzzfeed, Cecilia said:
"It seems that most people here mow before the rain comes, so he thought he would do that, and, well, ended up famous."
He may not have first-hand experience with tornadoes, but he did go to a seminar where "Tornado Hunters'" Greg Johnson was at, so that might have helped.