There is less than a minute of stoppage time remaining at the Emirates Stadium and Arsenal have a corner. This is surely their last chance to find a winning goal against Sheffield United. But there is a problem. Gabriel Martinelli is down in some discomfort and doesn't look like getting up. The frustration in the stands is palpable. A delay is the last thing Arsenal need right now. But the groans give way to cheers when an irate David Luiz sprints over to his young countryman and hauls him to his feet, reminding him of the urgency of the situation and ordering him to carry on. In the end, the corner did not provide the winner Arsenal needed. But the events which preceded it highlighted...
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