Literally they are walking ahead of you. Metaphorically, it could be they are taking the pressure of something, leaving you to be more relaxed, or simply venturing out ahead in some task in some way. If the wind is a good thing, it might be an annoyance that they are upwind of you If these don't fit, perhaps you could post the sentence?
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vdbI was looking for the literally meaning!'Literally meaning' doesn't sound right in the sentence to me. I think it should be 'literal meaning', but I am not sure. Any teacher please have a look into it.