The image of Vitali Klitschko, bullhorn in hand, mayhem all around him, is unforgettable. In November and December 2013, the Hall of Fame boxer had just ended his career, and was leading what became known as the Euromaidan protests in Kyiv, Ukraine.
A partially burned bus, its windows broken, sits still behind him, evidence of the danger in the streets.
As Klitschko begins to speak into the microphone, a man steps up with a fire extinguisher and sprays him in the face. Klitschko briefly disappears behind the cloud of white.