David Walcott, 35, Rammon Mali, 33, and a third suspect, had chased Rijkaard Siafa, 22, into an alleyway by Surrey Street market in Croydon, south London, where he was stabbed at least 13 times, the Old Bailey was told.
CCTV showed the defendants and Mr Siafa crossing paths at the junction of Surrey Street and Fellmongers Yard.
Mr Siafa turned back and ran into the yard, as the defendants reached into the waistband of their trousers and gave chase, jurors heard.
The defendants and the third man then headed to The Spread Eagle pub and bought three pints of Guinness with a £20 note, prosecutor Anthony Orchard KC had said.
Two men who ordered pints of Guinness in a pub, minutes after stabbing another man, have been found guilty of murder.
