The driver of the minibus has been giving evidence at the inquests into the A7 deaths.
William Darling, a driver with Telfords, said he saw the lorry drifting towards him across the white line.
"The next thing I knew, I was picking myself off the floor"
The driver was showered with glass and knocked unconscious by the impact, and spent time in hospital being treated for arm and shoulder injuries.
The inquest heard how other passengers on the bus found Miss Rennie on the floor where '"she was already dead".
The driver of the lorry involved in the accident, Ian McQueen, also died.
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Kerrie brings you Saturday's pollen forecast
Kerrie brings you Saturday's forecast
Showers Saturday afternoon & evening could bring torrential downpours, hail & lightning. Risk of localised flooding and longer journey times