If you don't know, go to the arrow. Don't guess.
Around here, in two man crews, your partner would have been responsible for that line. The lead has their sideline and the endline, while the trail just has their sideline. Your new lead probably has the best view on this play. If neither of you saw it, just go to the arrow. You have to make compromises in a two man crew, and this is one of them, IMO.
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