The La Liga match between Barcelona and Cadiz was stopped for nearly 50 minutes due to a medical incident involving a supporter.
Barcelona were leading 2-0 with fewer than 10 minutes remaining when the incident happened.
Before the players were removed from the field, Cadiz goalkeeper Jeremias Ledesma raced across the field with a first aid kit and flung it into the stands.
The fan was taken to hospital by ambulance and Barcelona boss Xavi said: “We all agreed to stop [the game].”
He added: “This sort of thing goes beyond football, we’re talking about a human life here.
“Fortunately they managed to save him.”
When the game resumed, there were two more goals, and Barcelona had won their fourth straight league game to move to the top of the standings.
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Frenkie de Jong of the Netherlands scored the opening goal for Barcelona, and Robert Lewandowski of Poland scored the second goal for the opponents soon after coming on as a replacement.
He has now scored nine goals in six appearances since his summer move from Bayern Munich.
Fellow substitute Ansu Fati added a third while France forward Ousmane Dembele rounded off the scoring late on.
Xavi’s side sit a point above champions Real Madrid, who play Mallorca on Sunday (13:00 BST).
Barcelona have scored 15 times and conceded just once since their opening-day stalemate against Rayo Vallecano.
