The brother of the pilot killed in a helicopter crash in central London said it would have been his "instinct" to do whatever he could to minimise casualties.
Chris Barnes, 55, from Nottingham, paid tribute to his brother Pete, calling him a "good guy".
He said: "It's a matter of instinct, it's what pilots do. He had 25 years and 10,500 hours experience. He was very good at what he did.
"Our condolences go out to the family of the other man who was killed, that's the last thing that my brother would have wanted to happen."
Pete Barnes, 50, from Berkshire, died on Wednesday when the helicopter he was flying hit a high-rise crane yards from Vauxhall station in central London at 8am.
Matthew Wood, 39, from Sutton, south London, was also killed as he was walking to work nearby.
Twelve people were injured in the tragedy, but police said the number of casualties could have been much higher.
Chris Barnes said his brother was "outgoing, very personable, good-looking guy with an irrepressible smile".
"When he walked into a room you knew he was there, he lit up a room. He was a good guy," he added.
Mr Barnes had two children, 12-year-old Alexandra and eight-year-old Freddie, with his partner Rebecca Dixon.
She told the Evening Standard: "Obviously he would have been frantic and the lives of others would have been at the forefront of his mind.
"It sums up the man. I find it very comforting and so do the children."
His brother said that lessons must be learned from the accident, and rules around the construction of skyscrapers in London may need to be tightened.
He said: "All we can say is that something's got to be learned from this. We've got to learn from a tragic accident like this."