Click to enlarge, and debate the strip below the line.

Keith Hackett's verdict

1) If you decide the noise was a deliberate attempt to distract the keeper, treat it as unsporting behaviour: show the taker a yellow card and restart with an indirect free-kick from the penalty mark. If not, award the goal. Professional goalkeepers should be well used to noise during penalties – so the offence would have to be obvious. Thanks to Jimmy McManners.

2) It is not up to the teams, it is up to you – and your decision must be based on safety. Only if you are happy that the artificial strip does not represent a danger to the players should you allow the game to go ahead. I remember refereeing in the US in the early 80s at the famous Wrigley Field, which had a flattened out pitching mound. It wasn't dangerous, so we went ahead. Thanks to Johannah Carroll.

3) You have two options. Going by the letter of the law you should play on: you and your assistants are considered part of the field of play, like a goalpost or corner flagpost – so if a player collides with you or an assistant, you play on. But there is also a chance to spare your assistant's blushes here: I would stop play to check both are unhurt, then restart with a dropped ball. Joshua Heppell wins the shirt.

Competition: win an official club shirt of your choice

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For a chance to win a club shirt of your choice from the range at Kitbag.com send us your questions for You are the Ref to you.are.the.ref@observer.co.uk. The best scenario used in the new YATR strip each Sunday wins a shirt to the value of £50 from Kitbag. Terms & conditions apply.

For more on the fifty year history of You Are The Ref, click here.