Can anyone explain what was the infraction that caused Bryn Mawr to play without a goalie for 13 minutes? wasnt there another goalie dressed?

USA MAGAZINE "Bryn Mawr (Md.) also shook up the rankings with a wild win over previous No. 4 Archbishop Spalding (Md.). The Mawrtians played the final 13 minutes of the game without a goalie due to an equipment infraction"