"When I first heard the noise, I thought the helicopter was about to land on the car park where I was," he added. "I really can't come to terms with what I've seen -- proper shock, yeah, genuinely shocked."
Labour Party spokesman Jim Murphy told the BBC he was trying to lend a hand at the site of the accident.
"It's a just a horrible, horrible scene," he said, according to ABC News Radio. "A pile of people clamoring out of a pub that's dust. No smoke. No fire. But just huge dust and people covered in dust and multiple injuries."
British Prime Minister David Cameron tweeted, "My thoughts are with everyone affected by the helicopter crash in Glasgow - and the emergency services working tonight."
MacLean told the BBC that the response in the pub was "a real testament, actually, to the people of Glasgow."
"Everyone in that pub were shouting, like, 'Here's the door. Come here,'" she said. "We were helping each other out."
ABC News' Micah Grimes and Ben Stein contributed to this report.