A week later, in English, this friend expressed to the class an opinion that the paper needed a proofreader, and wondered aloud who they'd choose.
The whole class pointed at me. I said that that was very kind, but I don't get on with the editor, etc.
Last week, someone from the class, but entirely unconnected with my friend and I, apparently went and told said editor that she thought I should proofread for the paper.
Said editor has just asked me if I'd mind proofreading for the paper.