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.
More top news
After a cold weekend the temperatures rise, but cloud, rain and stronger winds move in. Here's the forecast for the next few days
John Davidson, who grew up in Newcastleton, was killed while trying to arrest a suspect last week.
Police are looking at CCTV footage after money was taken from her bag in a shop in the town.