Cassidy, whose crash has gone viral on social media on Friday, admits he did not realise he had landed on the bonnet of a parked car.
But the Manx rider said he was thankful to have landed on the car, which he feels cushioned the fall.
“I didn’t even know anything about it,” he added.
“I was on the floor trying to catch my breath at the time and one of the marshals said, ‘have you seen the car?’
“To be honest, if I hadn’t hit that car, I’d possibly not be here today.”
He added: “I feel like a very lucky man. Very, very lucky. It’s all down to that car being there. If that wasn’t there, I would’ve come down and hit the concrete and it would’ve been a different game, wouldn’t it?”
Cassidy also thanked the medical staff who tended to him quickly after his incident.
“I took my helmet off and the doctors told me to sit down. They did all the checks, checked my heartrate, blood flow and I can’t thank them enough.
“The medical staff were fantastic, they were there straight away. They did a fantastic job.”
Having received medical attention, Cassidy was back working with his team in the North West 200 paddock on Friday.
When asked about people’s reaction, he said: “People are amazed by it. ‘How are you still here? How are you still walking?’
“People have fell off the second rung of a ladder and bust a hip, haven’t they? I’ve gone 25 [feet] up in the air, landed on a car bonnet, got up and walked away. Figure that one out.”