Falmouth, England (CNN) When President Donald Trump used his elbows at international summits, it was to throw them -- on trade, on Russia and, once, to help remove the Montenegrin prime minister from his path to a photo-op. His successor Joe Biden used his elbows differently this week. Arriving to his first global summit, he crooked his arm to extend pandemic-era greetings to a group of leaders who no longer have to tiptoe around a truculent and often angry American president. Officials attending this week's Group of 7 summit on the Cornish coast in England are emerging shell-shocked after four...