When dancers practice lifts they also practice like a kill switch sort of catches but that's very hard to do successfully with an amateur especially in the circumstance of being the final when emotions and nerves are high.
I think the show as a whole were VERY lucky that Ellie kept calm and managed to execute a fail safe.
There is a brief second as Vito realises the lift is going to go wrong were he genuinely looks terrified, I suspect that was part of his reaction sheer respect that she managed to avoid a concussion and did as they practiced.
With Craig being really impressed I do wonder if we will see it on the tour, would they really take that sort of risk?