Just querying why it's leurs and not leur here. In a previous dictée I was told that it would only be leurs plural if each of the parties had several of the thing being talked about. Well surely, they each only posessed one "look" which crossed with the other's one "look", so why not "leur"?
Dictation exercise B2
As you say sometimes we use the singular but in this case, you clearly have two looks crossing each other to meet a common point and the plural is required.
Bonne Continuation !
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