Crafting a friendly response

I want to acknowledge the claim and ask for specifics: 你说的是本赛季截至第几轮？小组赛还是淘汰赛某一阶段？

I could offer to verify with exact minutes and references from UEFA or Opta, listing each team’s leading, trailing, or tied minutes and any matches they've never trailed in. It's important to clarify the criteria, like whether to include stoppage time and how to handle two-legged matches.

If they want a quick check without using the web, I'll ask them to specify teams' matches or let me query. Also, I could propose creating a small leaderboard for teams that have "从未落后过."