He then assaulted the men, kidnapped them, and led them down to a nearby river in a two-hour ordeal, the Crown alleges.
Clemence denies all 18 charges, including two of kidnapping, nine of assault with intent to injure, assault, assault with a weapon, and threatening to kill or do grievous bodily harm.
Under cross-examination by defence counsel Chris McVeigh QC today, Pender-McLean became increasingly agitated in the witness box.
He said he was jumped while siphoning diesel by 8-10 people who had been waiting for him.
After being "smacked on the head" with a piece of wood, and seeing silhouettes of men holding bats, he believed that another car turned up with Clemence inside.
He claims Clemence assaulted him again, before being taken to a nearby river where he was blindfolded, thrown in the water, before being driven around to identify to his assailants where he lived.
Pender-McLean then says he was taken to Kaiapoi police station.
He claims he told the men they were a "pack of f***wits" who needed their heads read for taking him to the police in such a state.
When Mr McVeigh QC accused him of making up evidence, he replied: "Why would I make up evidence when it's as bad as it is. He's (Clemence) done what he's done."
Later, when pushed further over the accuracy of his evidence, Pender-McLean became angry and animated in the dock, and extra security was called in to the courtroom.
Judge Gary MacAskill called for an early adjournment.